Obesity treatment systems

ABSTRACT

In some embodiments, an extragastric balloon is described in which the balloon is contoured to fit a portion of the stomach but not circumscribe the stomach. In some embodiments, the extragastric balloon comprises multiple material components. In some embodiments, the extragastric balloon comprises multiple inflateable compartments. In some embodiments, the extragastric balloon is filled with one or more of a gas, liquid, solid, or foams to create portions of the balloon with differing densities or buoyancies. In some embodiments, multiple anchors contact the stomach, each of which are inflateable with a fluid such as a liquid, gas, or gel. In some embodiments, a pressure sensor is described which is programmable from a place external to the patient and can be programmed to increase its sampling frequency when an ingestion event is detected.

RELATED APPLICATIONS

The present application is a continuation-in-part of patent application Ser. No. 11/981,383 which is a continuation in part of PCT US2006015881 which is a continuation of application Ser. No. 11/278,806 “Management Systems for the Surgically Treated Obese Patient,” which is a continuation-in-part of patent application Ser. No. 11/295281 titled “Obesity Treatment Systems” filed Dec. 6, 2005 which is a continuation-in-part of International Patent Application PCT/US2005/033683 filed Sep. 19, 2005, which is a continuation-in-part of U.S. Non-Provisional patent application Ser. No. 11/148,519 entitled “Methods and Devices for Percutaneous, Non-Laparoscopic Treatment of Obesity,” filed on Jun. 9, 2005 by Michael Gertner, MD, and is also a continuation-in-part of U.S. Non-Provisional patent application Ser. No. 11/153,791 entitled “Methods and Devices for the Surgical Creation of Satiety and Biofeedback Pathways,” filed on Jun. 15, 2005, both of which are continuation-in-parts of U.S. Non-Provisional patent application Ser. No. 11/125547 by Michael Gertner, M.D., entitled “Percutaneous Gastroplasty” filed May 10, 2005, which is a continuation-in-part of International Patent Application No. PCT/US05/09322 filed Mar. 19, 2005, designating the United States, entitled “DEVICE AND METHODS TO TREAT A PATIENT” and which is a continuation-in-part of U.S. Non-Provisional patent application Ser. No. 10/974,248 by Michael Gertner, M.D. filed Oct. 27, 2004, entitled “DEVICES AND METHODS TO TREAT A PATIENT,” which claims priority to U.S. Provisional Patent Application Ser. No. 60/556,004 filed Mar. 23, 2004 by Michael Gertner, M.D., entitled “BARIATRIC DEVICES AND IMPLANTATION METHODS,” to U.S. Provisional Patent Application Ser. No. 60/584,219 filed Jul. 1, 2004 by Michael Gertner, M.D., entitled “DEVICES AND METHODS FOR PERCUTANEOUS GASTROPLASTY,” and to U.S. Provisional Patent Application Ser. No. 60/603,944 filed Aug. 23, 2004 by Michael Gertner, M.D., entitled “DEVICES AND METHODS TO TREAT MORBID OBESITY.” All of the above mentioned patents are incorporated herein by reference in their entirety.

Incorporation by Reference:

The Following additional patents and patent applications are incorporated by reference in their entirety: US20070250103, US20070250020, US20070250102, US20070250095, US20070250094, US20070250093, US20070250092, US20070250091, US20070250090, US20070250089, US20070250088, US20070250087.

FIELD OF THE INVENTION

The present invention relates to devices, methods and apparatus to treat obesity. Implantable devices, methods to implant implantable devices, and surgical devices to enable the implantation of the implantable devices in, around, or near the walls of organs or vessels are disclosed, including devices to appose the walls of the stomach. Feedback systems are also disclosed which enable multimodality therapy such as gastric restriction in combination with electrical stimulation of the stomach, sensing of feeding parameters, and/or other efferent or afferent neural pathways in a patient. Methods and related devices are also disclosed which relate to forming connections between body lumens.

DESCRIPTION OF THE RELATED ART

Obesity is a public health problem of extreme national and international importance. There are an estimated 60 million obese adults and 2 million obese adolescents in the United States as of 2004. By some estimates, there are 1 billion obese individuals worldwide. Indeed, to highlight the worldwide importance of the disease, a recent report estimated that over there are over 60 million obese individuals in China, a 10-fold increase since 2000. Obesity affects the life quality and productivity of those effected and leads to long-term health related complications such as diabetes and heart disease. Some researchers estimate that if the obesity epidemic is not brought under control, it could quickly overwhelm societal resources.

To date, surgery is the only proven method for inducing substantial weight loss. The mechanism behind the success of surgery is, in many cases, not known because obesity is such a complex, multifactorial disease. Some researchers propose that surgery does no more than provide biofeedback for appetite retraining. Other researchers maintain that surgery alters the physiology of the patient such that satiety is induced earlier or fewer nutrients are absorbed. Nonetheless, the consensus among most obesity researchers is that at the current time, long-term weight loss is only possible by surgical means and that the success of surgery is due to a multifactorial set of changes.

Over the past four decades, there have been numerous surgical procedures and devices developed to treat those who suffer from morbid obesity. In general, there are two physiologic components of all past and current procedures: malabsorption and mechanical restriction/volume reduction. Newer methods and devices include stimulation devices such as neurostimulators and muscle stimulators. In general, these devices will require further research and development before they will be used to treat obese patients as a single therapy.

Many of the procedures performed in the past have proven to be impractical, dangerous, and/or detrimental to patient health and are now of historical importance only. One example of a failed procedure was the jejuno-ileo bypass in which a malabsorptive state was created through the bypass of a large portion of the intestine through the creation of a surgical anastomosis between the jejunum and the ileum. While patients initially lost a great deal of weight, liver failure or liver damage occurred in over one-third of the patients, necessitating reversal of the surgical procedures.

One of the first restrictive type surgical procedures was the so-called “stomach stapling” operation in which a row of horizontal staples was placed across the upper stomach and then several staples were removed from the staple line to create an opening, the “os,” for a small amount of food, but not too much food. This procedure was mostly restrictive, leading to an early feeling of satiety. This surgery was abandoned because 70%-80% of patients had inadequate weight loss due to staple line dehiscence (i.e. the staples pulled through the stomach wall). A procedure to stabilize the staple line was performed by Smith et. al. (Lindsay B. Smith; Modification of the Gastric Partitioning Operation For Morbid Obesity. Am. J. Surgery 142, December 1981) in which the staple line was buttressed in the region where the staples were removed using teflon pledgets with sutures passing through the middle of the pledgets. The purpose of the pledgets was to buttress the suture and distribute the load across the suture to the pledget, thereby preventing the suture from pulling through the stomach and therefore stabilizing the os. The outcomes showed that the suture buttress was unequivocally able to prevent the suture from tearing through the stomach wall; indeed, over 90% of the patients showed excellent weight loss at 18 months.

The Roux-en-Y (The Roux) bypass operation has become the most commonly performed surgical procedure to treat the morbidly obese in the United States. It combines a small degree of malabsorption with a 90% reduction in the volume of the stomach. In the United States, 150,000 Roux procedures were performed in the year 2004. This number is expected to rise to 500,000 procedures by 2007. The procedure actually has been performed since the late 1970's but has evolved substantially over the past three decades into a relatively safe and effective procedure; indeed, the long-term data are very good. The advent of laparoscopic surgery and hence the laparoscopic Roux-en-Y bypass in combination with excellent follow-up results from the open (and laparoscopic) procedure are reasons for the proliferation of the Roux procedure.

Despite the efficacy of the Roux procedure and the recent laparoscopic improvements, it remains a highly invasive procedure with substantial morbidity, including a 1-2% surgical mortality, a 20-30% incidence of pulmonary morbidity such as pneumonia, pulmonary embolism, etc., and a 1-4% chance of leak at the anastomotic site which can result in a spectrum of consequences ranging from an extended hospital stay to death. Furthermore, it is not a good option for adolescents in whom the long-term consequences of malabsorption are not known. In addition, many patients resist such an irreversible, life altering procedure.

The Roux procedure requires general anesthesia and muscle paralysis which, in the morbidly obese population, is not of small consequence. There is also a substantial rate of anastomotic stricture which results in severe lifestyle changes for patients. As an example, many patients are forced to vomit after meals. Furthermore, although minor when compared to previous malabsorptive (e.g. jejuno-ileal bypass) procedures, the malabsorption created by the Roux-en-Y procedure can dramatically affect the quality of life of patients who undergo the procedure; for example, they may experience gas bloating, symptoms of the dumping syndrome, and/or dysphasia. In addition, these patients can experience very early fullness such that they are forced to vomit following meals.

Recently, minimally invasive procedures and devices which create a feeling of early satiety have been introduced into the marketplace in an attempt to address some of the issues above. The LAP-BAND™ is a band which encircles the stomach at the region of the fundus-cardia junction; it is a restrictive procedure similar to stomach stapling. It requires general anesthesia, a pneumoperitoneum, muscle paralysis, and extensive dissection of the stomach at the level the gastroesophageal junction. It also requires continual adjustment of the band, or restriction portion of the device. Although less invasive than the Roux procedure and potentially reversible, the LAP-BAND™ is nonetheless quite invasive. It also does not reduce the volume of the stomach by any great extent and some patients report a feeling of hunger much of the time. Furthermore, once implanted, the Lap-Band™, although it is adjustable by percutaneous means, is in fact very difficult to adjust and many iterative adjustments are required before it is made right.

Long-term clinical follow-up reveals that the banding procedure results in many complications. In a recently published article (Camerini et. al. Thirteen Years of Follow-up in Patients with Adjustable Silicone Gastric Banding for Obesity: Weight Loss and Constant Rate of Late Specific Complications. Obesity Surgery, 14, 1343-1348), the authors reported a 60% prevalence of late band removal secondary to complications such as erosion, slippage of the band, infection, or lack of effectiveness. Nonetheless, the LAP-BAND™ as a procedure is becoming very popular across the world as it is a less invasive and reversible procedure. The weight loss in long-term trials is considered adequate by some and inadequate by many; across various studies, the average weight loss is approximately 40% of excess body weight which is well below the weight loss in the Roux, VBG, and duodenal switch procedures (see below).

Other procedures which have been tried in the past and which offer varying degrees of weight loss include several variations of the original “gastroplasty” procedures. These procedures represent an evolution of the so-called “stomach stapling” procedure discussed above. These procedures were attempted prior to and concomitant with the evolution of the Roux-en-Y. They became popular (despite despite offering less weight loss than the Roux) because of their substantially less invasive nature and possible reversibility.

One such example is called the vertical banded gastroplasty, or VBG, which again, involves the creation of a restricting “os” for food. In the VBG, the border of the “os” is the lesser curvature of the stomach which is less apt to dilate than the fundus region of the stomach. Furthermore, the procedure completely excludes the fundus which is thought to easily dilate and in fact, is physiologically “programmed” to dilate during meals . . . so-called “receptive relaxation.” Dilation of the fundus as a result of continued overeating is a major reason for failure of the Lap-Band and in some cases the Roux procedure and the development of the VBG was intended to improve upon these outcomes. One issue with the VBG is that, as practiced today, it is not reversible, nor is it adjustable, and it is difficult to perform laparoscopically. As in the horizontal gastroplasty, the VBG utilizes standard staplers which, as in the horizontal gastroplasty, are unreliable when applied to the stomach. In the case of the VBG, the row of staples runs parallel to the lesser curvature of the stomach. An important reason for recurrent weight gain in the VBG is in fact recannulation of the staple line, leading to a so-called gastro-gastric fistula.

A recent, prospective, randomized trial, compared the VBG to the adjustable banding procedure and found that the VBG was overwhelmingly superior to the banding procedure (Morino et. al. Laparoscopic Adjustable Silicone Gastric Banding Versus Vertical Banded Gastroplasty in Morbidly Obese Patients. Annals of Surgery. Vol. 238 (6) pps. 835-842). Twenty five percent of the patients in the banding group returned to the operating room whereas there were no returns to the operating room in the gastroplasty group. The degree of weight loss was close to 60% of excess body weight after three years in the gastroplasty group and closer to 40% of excess body weight in the banding group. Although in this study, the VBG was successfully performed laparoscopically, the laparoscopic VBG procedure is in fact, difficult to perform, because the procedure is not standardized and a “tool box” does not exist for the surgeon to carry out the procedure; furthermore, the procedure is not a reversible one and relies on the inherently unreliable stapler systems.

A recent meta-analysis and systematic review (Buchwald et. al. Bariatric Surgery: A Systematic Review and Meta-analysis; JAMA vol. 292, no 14. pps 1724-1737) indicated that vertical gastroplasty (avg. excess weight loss of 68.2%) is superior to adjustable banding (avg excess weight loss of 47.5%) and gastric bypass (avg excess weight loss of 61.6%).

The Magenstrasse and Mill (M&M) procedure is an evolving gastroplasty technique wherein the greater curvature of the stomach is separated (stapled and cut) from the path of food, leaving a tube of stomach, the Magenstrasse, or “street of the stomach,” which is comprised of the lesser curvature. This procedure is similar to the VBG except that the longitudinal staple line of the stomach extends further along the lesser curvature and into the antrum. The theory behind leaving the antral “mill” is that it will continue to serve its normal function of mixing, grinding, retropulsion, and well-orchestrated expulsion of chyme into the duodenum. An authoritative study on the operation is incorporated herein by reference (Johnston et. al. The Magenstrasse and Mill Operation for Morbid Obesity; Obesity Surgery 13, 10-16).

In summary, the vertical gastroplasty procedure appears to be superior to the banding procedure. However, the vertical gastroplasty procedure is not easily performed laparoscopically and furthermore, it is not easily reversible. Therefore, a need exists to standardize the vertical banded gastroplasty and create a safer procedure which is also easy to perform, is durable, and is reversible.

The intragastric balloon is not a new concept. The intragastric balloon is meant to displace volume within the stomach such that a smaller volume of food leads to an earlier feeling of satiety. Currently, intragastric balloons on the market are not fixed to the stomach and consequently, can lead to complications such as obstruction and mucosal erosion. To avoid these complications, the balloons are removed after a maximum of six months. In a prospective, non-randomized, unblinded study (Sallet et. al. Brazilian Multicenter Study of the Intragastric Balloon; Obesity Surgery, 14, 991-998), the average excess weight loss was 48.3% after 1 year. However, the incidence of nausea and vomiting was 40% and epigastric pain was 20%; balloon impaction occurred in 0.6% of patients. A balloon which is fixed to the wall of the stomach could potentially improve the intragastric balloon device and allow longer-term implantation.

More recently, there has been an effort to develop even less invasive devices and procedures which do not involve incisions at all. For the most part, these procedures are performed from within the stomach with an endoscope and by a physician with a high degree of endoscopic skill. For example, U.S. Pat. No. 6,558,400 describes methods and devices to create partitions in the stomach. Anchors or staplers applied through an endoscope from within the stomach are used to accomplish the partitions. Similarly, U.S. Patent Application Publication No. 2004/0122456 describes another set of methods and devices to reduce the volume of the stomach. Expandable anchors are deployed both on the anterior and posterior wall of the stomach using an endoscope. Flexible sutures are brought out of the patient's mouth and the sutures are crimped together within the stomach in order to bring the walls of the stomach closer together. The final configuration has a discontinuous connector positioned between the anterior and posterior anchors. Patent application U.S. Pat. No. 6,773,440 describes a device which is advanced through an endoscope and grasps or applies suction to a fold of mucosa to apply anchors through the mucosal and serosal layers of the stomach.

Endoscopic procedures to manipulate the stomach can be time consuming because of the technical difficulty of the endoscopy; they also require a large endoscope through which many instruments need to be placed for these complex procedures. Due to the large size of the endoscope, patients typically will require general anesthesia, which limits the “non-invasive” aspects of the procedure. Furthermore, the procedures require advanced endoscopic skill which would need to be acquired by most endoscopic practitioners outside of academic institutions. Such skill adaptation can take a significant amount of time, which will limit adoption of the procedure by the physician community. A further issue is that there is a limitation on the size of the anchors and devices which can be placed in the stomach because the endoscope has a maximum permissible size.

Percutaneous Endoscopic Gastrostomy (PEG) refers to a procedure in which a gastrocutaneous tract is created using a percutaneous procedure (see below for definition). A recent update of the procedure can be found on the Society of American Gastrointestinal Endoscopic Surgeons (SAGES) website, and is incorporated herein by reference. Briefly, the procedure involves insufflation of the stomach with and under visualization with an endoscope. A small incision is made in the skin and a needle is advanced into the stomach (the stomach sits just under the abdominal wall when insufflated) under endoscopic visualization. A feeding tube is then placed over the needle to create a gastrocutaneous tract with the feeding tube inside the tract with the needle subsequently removed. The feeding tube is secured with an external bolster to creates a tubular tract from outside the patient through the skin of the abdominal wall and residing inside the stomach. Over the ensuing weeks, a permanent tract evolves between the stomach mucosa and epithelium of the skin, after which, the bolster can be removed without consequence. When the feeding tube is to be removed, the gastrocutaneous tract will close on its own as food will preferentially be delivered antegrade (the path of least resistance) to the duodenum, thereby allowing the tract to heal.

SUMMARY OF THE INVENTION

The present invention discloses implantable devices, instruments and methods for treatment of obesity. In one embodiment, an implantable device is provided that includes an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; an anchor configured to fix a portion of the main body member in a position relative to at least one internal body structure, without piercing through a wall of the stomach; an adjustment member having a port that is accessible by an instrument to effect expansion or contraction of the main body, the adjustment member configured to be anchored to an abdominal wall or subcutaneously external to the abdominal wall; and a conduit connecting the main body with the adjustment member, wherein the device is configured to be implanted without piercing through the stomach wall.

A method of treating obesity in a patient is provided, wherein the method includes: making a percutaneous opening to the abdominal cavity of the patient; passing an expandable device, while in a contracted configuration, through the opening; positioning the expandable device adjacent the stomach of the patient; expanding the expandable device; and anchoring the expandable device, relative to at least one structure in the abdominal cavity, without piercing through a wall of the stomach.

A method of treating obesity in a patient is provided wherein the method includes: making a minimally invasive opening to the abdominal cavity of the patient; passing an expandable device, while in a contracted configuration, through the opening; positioning the expandable device adjacent the stomach of the patient; anchoring the expandable device to at least one structure in the abdominal cavity, without piercing through a wall of the stomach; and expanding the expandable device.

A method of treating obesity in a patient is provided wherein the method includes: making a percutaneous opening to the abdominal cavity of the patient; passing an expandable device, while in a contracted configuration, through the opening; positioning the expandable device adjacent the stomach of the patient; expanding the expandable device to occupy a volume of space and substantially prevent the stomach from expanding into the volume of space; and anchoring the expandable device to at least one structure in the abdominal cavity, without piercing through a wall of the stomach.

A method of treating obesity in a patient is provided wherein the method includes: making a minimally invasive opening to the abdominal cavity of the patient; passing an expandable device, while in a contracted configuration, through the opening; positioning the expandable device adjacent the stomach of the patient; passing an intra-gastric expandable device within the interior cavity of the stomach; expanding the intra-gastric expandable device to a predetermined size or pressure; expanding the expandable device to displace a portion of the stomach wall; monitoring the expanding of the expandable device and displacement of the portion of the stomach wall; and ceasing expanding the expandable device when the distance between the portion of the stomach wall being displaced and the intra-gastric expandable device reaches a predetermined distance or when a predetermined pressure is monitored via the intra-gastric expandable device.

A kit for treatment of obesity is provided including: an implantable, expandable body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; and an intra-gastric expandable device configured to be passed trans-orally into the interior cavity of the stomach, the intra-gastric expandable device comprising an inflatable main body configured to be received in the cavity of the stomach, and a conduit of sufficient length to extend out of the mouth of the patient when the inflatable main body is fully received in the cavity of the stomach.

A delivery device is provided for delivering an expandable device for treatment of obesity, percutaneously into an abdominal cavity of a patient. The device includes an elongated outer cannula having sufficient length to receive the expandable device when the expandable device is in a contracted configuration; an introducer nosecone, at least a proximal portion of which is configured to be received within a distal opening of the elongated outer cannula; a rod passing through the elongated cannula and interconnecting the introducer nosecone distally with a drive handle proximally, the rod being dimensioned to receive the expandable device thereover when the expandable device is in a contracted configuration, and the rod extending proximally of a proximal end of the outer cannula, by a distance greater than or equal to a length of the expandable device in a contracted configuration; a stop on the rod configured to be positioned proximally of a proximal end of the expandable device in a contracted configuration when the expandable device is mounted on the rod, to prevent backsliding of the expandable device; and a locking mechanism to prevent sliding of the elongated cannula proximally with respect to the rod when the locking mechanism is in a locked configuration, and to permit sliding of the elongated cannula proximally with respect to the rod when the locking mechanism is in an unlocked configuration.

An implantable device for treatment of obesity is provided which is configured to assume a contracted configuration as well as an expanded configuration, wherein the contracted configuration reduces a cross-sectional area of the device to a cross-sectional area suitable for passing the device through a port into the abdominal cavity using a minimally invasive procedure, and when in the expanded configuration, the device occupies a volume to prevent the stomach of a patient from expanding into the volume. The device further includes an anchor configured to fix the device in a position relative to at least one internal body structure, without piercing through a wall of the stomach.

An adjustment member configured to be anchored to a patient externally of a body cavity is provided, wherein the adjustment member is configured to be in fluid communication with a conduit leading into the body cavity. The adjustment member further includes a port that is accessible by an instrument to deliver fluid therethrough; and a homing mechanism configured to home a delivery needle into the port.

An adjustment member and a delivery device are provided, wherein the adjustment member is configured to be anchored to a patient externally of a body cavity. The adjustment member is configured to be in fluid communication with a conduit leading into the body cavity. The adjustment member further includes a port that is accessible by a delivery needle of the delivery device to deliver fluid therethrough. The delivery needle includes a side opening for delivering fluid therethrough when a distal end of the delivery needle engages the port.

An implantable device for treatment of obesity is provided that includes: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; an anchor configured to fix a portion of the main body member in a position relative to at least one internal body structure, without piercing through a wall of the stomach; an adjustment member having a port that is accessible by an instrument to effect expansion or contraction of the main body, wherein the adjustment member is located in the expandable main body member; and a removable conduit having an expandable tip wherein upon implantation of the expandable main body the removable conduit is attached to the adjustment member and after expansion of the expandable main body the expandable tip is retracted and the removable conduit is removed.

A method of treating obesity is provided that includes: placing a space occupying device within an abdominal cavity in proximity to a stomach; expanding the space occupying device to reduce the space available for the stomach to expand; and leaving the space occupying device in proximity to the stomach for sufficient time to remodel the stomach.

A method of treating obesity is provided that includes: placing a space occupying device within an abdominal cavity in contact with a stomach; and expanding the space occupying device to constrain the stomach to a curved tubular shape.

A method of creating a feeling of satiety is provided, to include: positioning an expandable device in proximity to a stomach without penetrating a wall of the stomach; and expanding the expandable device to reduce an achievable maximum volume of the stomach, wherein the stomach is free to move.

A method of treating obesity is provided, including: positioning an expandable device in proximity to a stomach; and expanding the expandable device to surround portions of the stomach so as to constrain a largest capable dimension of the stomach by fifty percent or more.

These and other features of the invention will become apparent to those persons skilled in the art upon reading the details of the devices, methods, instruments and kits as more fully described below.

At least one method embodiment comprises the steps of: passing a device, including an expandable member in a collapsed configuration, through an opening in the skin of the patient, and into the abdominal cavity of the patient; anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity, without piercing the stomach; and expanding the expandable member to an expanded configuration in a space in the abdominal cavity to perform at least one of: prevention of expansion of the stomach of the patient into the space; and compression of a portion of the stomach.

A method of implanting a weight-loss treatment device by connecting the device to an anchoring frame is provided, including the steps of: passing the anchoring frame into the abdominal cavity of the patient; anchoring the anchoring frame to at least one structure in the abdominal cavity, without piercing the stomach; passing the device, including an expandable member in a compressed configuration, into the abdominal cavity of the patient; and passing the device over the anchoring frame to anchor the device to the anchoring frame.

A method of implanting a weight-loss treatment device by connecting the device to an anchoring frame is provided, including: passing the anchoring frame into the abdominal cavity of the patient; passing the device, including an expandable member in a collapsed configuration, into the abdominal cavity of the patient; and passing the device over the anchoring frame to mechanically lock the device to the anchoring frame and to anchor the anchoring frame to at least one structure in the abdominal cavity, without piercing the stomach.

An implantable device for inducing weight loss is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid, wherein the expandable body member comprises a wall surrounding an internal chamber, the wall being substantially impervious to the pressurized fluid; wherein the expandable main body member further comprises a safety valve configured to open when a pressure inside the expandable main body exceeds a predetermined maximum pressure; and a reserve chamber in fluid communication with the safety valve to receive at least a portion of the pressurized fluid in the internal chamber of the expandable main body member when the safety valve opens.

An anchoring frame for anchoring a device to an internal structure in a patient's body is provided, including: an elongated main body having proximal and distal ends; at least one channel running substantially over a length of the main body; a contact surface adapted to contact the internal structure in the patient's body; anchors positioned in the anchoring frame for being driven through the contact surface and into the internal structure; and a deployment driver slidable through at least one of the at least one channels, wherein sliding the deployment driver through the at least one channel drives the anchors through the contact surface. A combination of an implantable device engaged with an anchoring frame is provided, wherein the implantable device include an expandable member having at least one key extending therefrom or groove formed therein; the anchoring frame includes an elongated main body having proximal and distal ends, and at least one channel or rail running substantially over a length of the main body; and wherein the rail is receivable in the groove and the at least one key is receivable in the channel to mechanically connect the device with the anchoring frame.

An anchoring frame for anchoring a device to an internal structure in a patient's body is provided, including: an elongated main body having proximal and distal ends; at least one channel running substantially over a length of the main body; a contact surface adapted to contact the internal structure in the patient's body; anchors positioned in the anchoring frame for being driven through the contact surface and into the internal structure; and a deployment driver slidable through at least one of the at least one channels, wherein sliding the deployment driver in a first direction through the at least one channel contacts the driver with first portions of the anchors and drives the anchors through the contact surface, and wherein subsequently sliding the deployment driver in a second direction through the at least one channel contact the driver with second portion s of the anchors and retracts the anchors from extending through the contact surface.

An anchoring frame deployment tool configured to deliver an anchoring frame percutaneously to a surgical target area in a patient is provided, the tool including: a handle for manual operation by a user; an elongated shaft extending distally from the handle; and an engagement feature provided on a distal end portion of the shaft, configured to engage a channel or a rail of the anchoring frame.

An anchoring frame deployment tool is provided, including: an elongated shaft having a proximal portion and a distal portions rotatably linked to the proximal portion; an actuator mechanically linked to the distal portion and operable by a user to rotate the distal portion in first and second opposite directions relative to the proximal portion; and a recess or cavity formed in the distal portion shaped and dimensioned to receive the anchoring frame therein.

An anchoring frame unlocking tool is provided, including: a handle for manipulation by a user; an elongated shaft extending distally from the handle; and a lock depressor extending radially from a distal end portion of the elongated shaft, the lock depressor configured to be mounted on and to slide over a rail of an anchoring frame, and to depress automatic locking structures as the lock depressor passes over the automatic locking structures

An implantable device for treatment of obesity is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid; two sets of looped tabs extending substantially along two lines in a longitudinal direction of the expandable main body member, wherein, in an un-expanded configuration in which the main body member lies substantially flat, the two lines are offset, and wherein the main body member is configured to be rolled up, in the unexpanded configuration, into a compact configuration wherein the two lines align and set two sets of looped tabs align so that a shaft, rod or wire can be inserted through the looped tabs to maintain the expandable main body member in the compact configuration.

An introducer configured to deliver an implantable device into an abdominal cavity of a patient via a percutaneous, laparoscopic or mini-laparoscopic procedure is provided, including: a proximal shaft portion; a splittable introducer housing forming a distal portion of the introducer, the splittable introducer including a plurality of jaws pivotally mounted to the proximal shaft portion and pivotable between an open configuration and a closed configuration, wherein in the closed configuration, the jaws define an internal space configured and dimensioned for receiving the implantable device therein; and an actuator extending proximally of the jaws and operable by a user to open and close the jaws. An introducer configured to deliver an implantable device into an abdominal cavity of a patient via a percutaneous, laparoscopic or mini-laparoscopic procedure, the introducer comprising: an inner sheath, the inner sheath comprising a distal end portion configured to receive the device wrapped there around in a compact configuration; and an outer sheath dimensioned to slide over the inner sheath and the device in the compact configuration, to maintain the device in the compact configuration while delivering the device; wherein the outer sheath is retractable from the distal end portion of the inner sheath and the device, to expose the device to be extracted for implantation at a surgical target site, and wherein the distal end portion of the inner sheath is bendable at an angled to a longitudinal axis of the introducer, when the outer sheath is retracted, to reorient the device to facilitate extraction thereof.

An access member attachment system is provided, including: a tool having a handle at a proximal end portion thereof; a working end at a distal end portion thereof, the working end including a socket shaped and dimensioned to receive an access member therein and to maintain an orientation of the access member relative to the working end during attachment of the access member to a patient; and an anvil configured to slide over a conduit to which the access member is to be attached.

A method of attaching an access member to a conduit in fluid connection with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the method includes: sliding an anvil over the conduit at a location external of the abdominal cavity; inserting the anvil through an opening in the abdominal wall while continuing to slide the anvil over the conduit; orienting an anvil surface of the anvil against an inner surface of the abdominal wall; while holding the anvil surface pressed against the inner surface of the abdominal wall, driving the access member against an outer surface of the abdominal wall, thereby driving attachment members of the access member through the abdominal wall and against the anvil surface, whereby the attachment members are deformed against the anvil surface, thereby anchoring the access member to the abdominal wall.

An access member having undeployed and deployed configurations is provided, including: at least one port adapted to be placed in fluid communication with a conduit, the access member having a first outside diameter at a distal portion thereof, in the undeployed configuration, that is less than a second outside diameter of the access member at a distal portion thereof when in the deployed configuration.

A quick connect access member for attachment to a patient in fluid communication with a conduit in fluid communication with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the access member includes: a base having a contact surface adapted to abut an inner surface of an abdominal wall of the patient; a tubular spacer having a length adapted to span a thickness of the abdominal wall, a proximal end portion of the spacer being provided with a lip; and an external portion connectable to the tubular spacer with a snap fit and configured to press against an external surface of the abdominal wall.

A quick connect access member for attachment to a patient in fluid communication with a conduit in fluid communication with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the access member includes: a base having a contact surface adapted to abut an inner surface of an abdominal wall of the patient, the base including a socket portion having one or more sets of spring-loaded bearings or detents and a tubular spacer having a length adapted to span a thickness of the abdominal wall; and an external portion connectable to the base portion, the external portion have a distally extending tubular portion have at least one annular recess circumscribing an external surface thereof, configured to mate with the one or more sets of spring loaded bearings or detents.

A method of treating a patient is provided, including: passing a device including an expandable member through the skin of the patient, through the abdominal wall of the patient and into the abdominal cavity of the patient; expanding the expandable member in a space in the abdominal cavity to perform at least one of: prevention of expansion of the stomach of the patient into the space; and compression of a portion of the stomach; and anchoring the expanded expandable member against the abdominal wall of the patient.

A method of treating a patient is provided, including: passing a device including an expandable member through a minimally invasive opening through the skin of the patient and the abdominal wall of the patient, and into the abdominal cavity of the patient; accessing a tether looped through a positioning member on the expandable member from a second minimally invasive opening; and drawing the tether through the second minimally invasive opening and drawing on the position member to reorient the expandable member.

An implantable device for treatment of obesity is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid; and an attachment tab extending from the expandable main body member.

In at least one embodiment, the attachment tab comprises at least one structural member therein, the at least one structural member being deformable to facilitate passage through a small opening in a patient, and wherein the at least one structural member returns to an undeformed configuration upon entering the abdominal cavity to orient the attachment tab toward a structure in the abdominal cavity to attach the attachment tab to.

A method of f treating a patient is provided, with the method including: passing a flexible endoscope through an opening in the skin of the patient, and into the abdominal cavity of the patient; passing a device including an expandable member in a collapsed configuration over the flexible endoscope and into the abdominal cavity of the patient; anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity; and removing the flexible endoscope from the patient.

A method of treating a patient is provided, including: passing a flexible wire through an opening in the skin of the patient, and into the abdominal cavity of the patient; viewing through a distal end portion of the flexible wire; passing a device including an expandable member in a collapsed configuration over the flexible wire and into the abdominal cavity of the patient; and anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity.

At least one method embodiment comprises the steps of: passing a device, including an expandable member in a collapsed configuration, through an opening in the skin of the patient, and into the abdominal cavity of the patient; anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity, without piercing the stomach; and expanding the expandable member to an expanded configuration in a space in the abdominal cavity to perform at least one of: prevention of expansion of the stomach of the patient into the space; and compression of a portion of the stomach.

A method of implanting a weight-loss treatment device by connecting the device to an anchoring frame is provided, including the steps of: passing the anchoring frame into the abdominal cavity of the patient; anchoring the anchoring frame to at least one structure in the abdominal cavity, without piercing the stomach; passing the device, including an expandable member in a compressed configuration, into the abdominal cavity of the patient; and passing the device over the anchoring frame to anchor the device to the anchoring frame.

A method of implanting a weight-loss treatment device by connecting the device to an anchoring frame is provided, including: passing the anchoring frame into the abdominal cavity of the patient; passing the device, including an expandable member in a collapsed configuration, into the abdominal cavity of the patient; and passing the device over the anchoring frame to mechanically lock the device to the anchoring frame and to anchor the anchoring frame to at least one structure in the abdominal cavity, without piercing the stomach.

An implantable device for inducing weight loss is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid, wherein the expandable body member comprises a wall surrounding an internal chamber, the wall being substantially impervious to the pressurized fluid; wherein the expandable main body member further comprises a safety valve configured to open when a pressure inside the expandable main body exceeds a predetermined maximum pressure; and a reserve chamber in fluid communication with the safety valve to receive at least a portion of the pressurized fluid in the internal chamber of the expandable main body member when the safety valve opens.

An anchoring frame for anchoring a device to an internal structure in a patient's body is provided, including: an elongated main body having proximal and distal ends; at least one channel running substantially over a length of the main body; a contact surface adapted to contact the internal structure in the patient's body; anchors positioned in the anchoring frame for being driven through the contact surface and into the internal structure; and a deployment driver slidable through at least one of the at least one channels, wherein sliding the deployment driver through the at least one channel drives the anchors through the contact surface.

A combination of an implantable device engaged with an anchoring frame is provided, wherein the implantable device include an expandable member having at least one key extending therefrom or groove formed therein; the anchoring frame includes an elongated main body having proximal and distal ends, and at least one channel or rail running substantially over a length of the main body; and wherein the rail is receivable in the groove and the at least one key is receivable in the channel to mechanically connect the device with the anchoring frame.

An anchoring frame for anchoring a device to an internal structure in a patient's body is provided, including: an elongated main body having proximal and distal ends; at least one channel running substantially over a length of the main body; a contact surface adapted to contact the internal structure in the patient's body; anchors positioned in the anchoring frame for being driven through the contact surface and into the internal structure; and a deployment driver slidable through at least one of the at least one channels, wherein sliding the deployment driver in a first direction through the at least one channel contacts the driver with first portions of the anchors and drives the anchors through the contact surface, and wherein subsequently sliding the deployment driver in a second direction through the at least one channel contact the driver with second portion s of the anchors and retracts the anchors from extending through the contact surface.

An anchoring frame deployment tool configured to deliver an anchoring frame percutaneously to a surgical target area in a patient is provided, the tool including: a handle for manual operation by a user; an elongated shaft extending distally from the handle; and an engagement feature provided on a distal end portion of the shaft, configured to engage a channel or a rail of the anchoring frame.

An anchoring frame deployment tool is provided, including: an elongated shaft having a proximal portion and a distal portions rotatably linked to the proximal portion; an actuator mechanically linked to the distal portion and operable by a user to rotate the distal portion in first and second opposite directions relative to the proximal portion; and a recess or cavity formed in the distal portion shaped and dimensioned to receive the anchoring frame therein.

An anchoring frame unlocking tool is provided, including: a handle for manipulation by a user; an elongated shaft extending distally from the handle; and a lock depressor extending radially from a distal end portion of the elongated shaft, the lock depressor configured to be mounted on and to slide over a rail of an anchoring frame, and to depress automatic locking structures as the lock depressor passes over the automatic locking structures.

An implantable device for treatment of obesity is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid; two sets of looped tabs extending substantially along two lines in a longitudinal direction of the expandable main body member, wherein, in an un-expanded configuration in which the main body member lies substantially flat, the two lines are offset, and wherein the main body member is configured to be rolled up, in the unexpanded configuration, into a compact configuration wherein the two lines align and set two sets of looped tabs align so that a shaft, rod or wire can be inserted through the looped tabs to maintain the expandable main body member in the compact configuration.

An introducer configured to deliver an implantable device into an abdominal cavity of a patient via a percutaneous, laparoscopic or mini-laparoscopic procedure is provided, including: a proximal shaft portion; a splittable introducer housing forming a distal portion of the introducer, the splittable introducer including a plurality of jaws pivotally mounted to the proximal shaft portion and pivotable between an open configuration and a closed configuration, wherein in the closed configuration, the jaws define an internal space configured and dimensioned for receiving the implantable device therein; and an actuator extending proximally of the jaws and operable by a user to open and close the jaws.

An introducer configured to deliver an implantable device into an abdominal cavity of a patient via a percutaneous, laparoscopic or mini-laparoscopic procedure, the introducer comprising: an inner sheath, the inner sheath comprising a distal end portion configured to receive the device wrapped there around in a compact configuration; and an outer sheath dimensioned to slide over the inner sheath and the device in the compact configuration, to maintain the device in the compact configuration while delivering the device; wherein the outer sheath is retractable from the distal end portion of the inner sheath and the device, to expose the device to be extracted for implantation at a surgical target site, and wherein the distal end portion of the inner sheath is bendable at an angled to a longitudinal axis of the introducer, when the outer sheath is retracted, to reorient the device to facilitate extraction thereof.

An access member attachment system is provided, including: a tool having a handle at a proximal end portion thereof; a working end at a distal end portion thereof, the working end including a socket shaped and dimensioned to receive an access member therein and to maintain an orientation of the access member relative to the working end during attachment of the access member to a patient; and an anvil configured to slide over a conduit to which the access member is to be attached.

A method of attaching an access member to a conduit in fluid connection with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the method includes: sliding an anvil over the conduit at a location external of the abdominal cavity; inserting the anvil through an opening in the abdominal wall while continuing to slide the anvil over the conduit; orienting an anvil surface of the anvil against an inner surface of the abdominal wall; while holding the anvil surface pressed against the inner surface of the abdominal wall, driving the access member against an outer surface of the abdominal wall, thereby driving attachment members of the access member through the abdominal wall and against the anvil surface, whereby the attachment members are deformed against the anvil surface, thereby anchoring the access member to the abdominal wall.

An access member having undeployed and deployed configurations is provided, including: at least one port adapted to be placed in fluid communication with a conduit, the access member having a first outside diameter at a distal portion thereof, in the undeployed configuration, that is less than a second outside diameter of the access member at a distal portion thereof when in the deployed configuration.

A quick connect access member for attachment to a patient in fluid communication with a conduit in fluid communication with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the access member includes: a base having a contact surface adapted to abut an inner surface of an abdominal wall of the patient; a tubular spacer having a length adapted to span a thickness of the abdominal wall, a proximal end portion of the spacer being provided with a lip; and an external portion connectable to the tubular spacer with a snap fit and configured to press against an external surface of the abdominal wall.

A quick connect access member for attachment to a patient in fluid communication with a conduit in fluid communication with an expandable member implanted in an abdominal cavity of a patient is provided, wherein the access member includes: a base having a contact surface adapted to abut an inner surface of an abdominal wall of the patient, the base including a socket portion having one or more sets of spring-loaded bearings or detents and a tubular spacer having a length adapted to span a thickness of the abdominal wall; and an external portion connectable to the base portion, the external portion have a distally extending tubular portion have at least one annular recess circumscribing an external surface thereof, configured to mate with the one or more sets of spring loaded bearings or detents.

A method of treating a patient is provided, including: passing a device including an expandable member through the skin of the patient, through the abdominal wall of the patient and into the abdominal cavity of the patient; expanding the expandable member in a space in the abdominal cavity to perform at least one of: prevention of expansion of the stomach of the patient into the space; and compression of a portion of the stomach; and anchoring the expanded expandable member against the abdominal wall of the patient.

A method of treating a patient is provided, including: passing a device including an expandable member through a minimally invasive opening through the skin of the patient and the abdominal wall of the patient, and into the abdominal cavity of the patient; accessing a tether looped through a positioning member on the expandable member from a second minimally invasive opening; and drawing the tether through the second minimally invasive opening and drawing on the position member to reorient the expandable member.

An implantable device for treatment of obesity is provided, including: an expandable main body member configured to be positioned adjacent a portion of a stomach of a patient, within the abdominal cavity of the patient; the expandable member being inflatable with pressurized fluid; and an attachment tab extending from the expandable main body member.

In at least one embodiment, the attachment tab comprises at least one structural member therein, the at least one structural member being deformable to facilitate passage through a small opening in a patient, and wherein the at least one structural member returns to an undeformed configuration upon entering the abdominal cavity to orient the attachment tab toward a structure in the abdominal cavity to attach the attachment tab to.

A method of f treating a patient is provided, with the method including: passing a flexible endoscope through an opening in the skin of the patient, and into the abdominal cavity of the patient; passing a device including an expandable member in a collapsed configuration over the flexible endoscope and into the abdominal cavity of the patient; anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity; and removing the flexible endoscope from the patient.

A method of treating a patient is provided, including: passing a flexible wire through an opening in the skin of the patient, and into the abdominal cavity of the patient; viewing through a distal end portion of the flexible wire; passing a device including an expandable member in a collapsed configuration over the flexible wire and into the abdominal cavity of the patient; and anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity.

The present invention provides methods, devices, tools and assemblies for treating a patient to assist with weight loss. One method embodiment involves passing a device including an expandable member in a collapsed configuration and a buoyancy member into the abdominal cavity of the patient, and anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity.

A method of treating a patient is provided that includes the steps of: passing a device into the abdominal cavity of the patient, wherein the device includes at least one attachment member extending from a main body portion thereof; positioning an inferior portion of the device in the abdominal cavity; and anchoring that at least one attachment member to an inner surface of the abdominal wall.

A method of treating a patient is provided that includes steps of: passing a guide rail into the abdominal cavity of the patient; passing an anchoring frame, guided by the guide rail, into the abdominal cavity; anchoring the anchoring frame to at least one structure in the abdominal cavity; passing a device, guided by the guide rail, into the abdominal cavity; and attaching the device to the anchoring frame.

A method of treating a patient is provided that includes steps of: passing a guide rail into the abdominal cavity of the patient, wherein the guide rail is selected from one of: at least one guidewire; at least one flexible wire facilitating viewing out of a distal end portion thereof from a proximal end portion thereof; at least one rod; or a flexible steerable catheter; passing an anchoring frame, guided by the guide rail, into the abdominal cavity; anchoring the anchoring frame to at least one structure in the abdominal cavity; passing a device, guided by the guide rail, into the abdominal cavity; and attaching the device to the anchoring frame.

A method of treating a patient is provided, including steps of: passing an anchoring frame into the abdominal cavity of the patient; delivering anchoring members, attached to the anchoring frame, through at least one structure in the abdominal cavity that the anchoring frame is to be anchored to, through the skin and out of the patient; fixing the anchoring members externally of the abdominal cavity to anchor the anchoring frame to the at least one structure in the abdominal cavity; passing a device, into the abdominal cavity; and attaching the device to the anchoring frame.

A method of treating a patient is provided, including steps of: passing a buoyancy member into the abdominal cavity of the patient; anchoring the buoyancy member to at least one structure in the abdominal cavity; passing a device into the abdominal cavity; and attaching the device to the buoyancy member.

A method of treating a patient is provided, including steps of: passing a device including an expandable member having at least one trans-abdominally detectable marker; advancing the device into the abdominal cavity of the patient while tracking and guiding the advancing by trans-abdominally detecting the location of the at least one marker, relative to the patient's anatomy, as the device is advanced; and anchoring at least a portion of the expandable member, relative to at least one structure in the abdominal cavity.

A method of monitoring functionality of a device implanted in the abdominal cavity of a patient to enhance weight loss is provided, including: providing a handheld monitoring device outside of the patient; and wirelessly communicating with at least one sensor on the device located in the abdominal cavity.

A method of treating a patient is provided, including: providing a device implanted in the abdominal cavity of the patient, wherein the device occupies a space in the abdominal cavity to perform at least one of: prevention of expansion of the stomach of the patient into the space and compression of a portion of the stomach; wherein the device includes at least one electrode on a surface thereof in contact with the stomach of the patient, said at least one electrode being electrically connected to a stimulation signal controller; and delivering a stimulation signal from the controller to the at least one electrode to stimulate at least one contraction of at least one muscle in the stomach.

A method of treating a patient is provided, including: passing a device into the abdominal cavity of the patient; anchoring at least a portion of the device, relative to at least one structure in the abdominal cavity; and occupying a space in the abdominal cavity with the device to substantially restrict expansion of the fundus of the stomach, and restraining the stomach to a shape resembling a tube, but wherein at least a portion of the antrum is left unrestrained.

A method of treating a patient is provided, including: passing a device into the abdominal cavity of the patient; anchoring at least a portion of the device, relative to at least one structure in the abdominal cavity; and occupying a space in the abdominal cavity with the device to substantially restrict expansion of the fundus of the stomach, and restraining the stomach to a shape resembling a tube, but wherein a small pouch is left unrestrained at a superior end portion of the stomach.

An implantable device for treatment of a patient to assist weight loss is provided, wherein the device includes: an expandable member configured to be positioned in an abdominal cavity of the patient, the expandable member configured to be expanded from a contracted configuration to an expanded configuration after placement of the device in the abdominal cavity, and to substantially maintain a size and shape of the expanded configuration. The expandable member, in the expanded configuration, has a buoyancy characteristic relative to its surrounding when implanted in the abdominal cavity. The device further includes a buoyancy member having a buoyancy characteristic different from the buoyancy characteristic of the expandable member, to alter a combined buoyancy characteristic of the device.

A method of making an implantable device for treatment of a patient to assist weight loss is provided, wherein the device includes an expandable member configured to be positioned in an abdominal cavity of the patient, the expandable member configured to be expanded from a contracted configuration to an expanded configuration after placement of the device in the abdominal cavity, and to substantially maintain a size and shape of the expanded configuration, and a buoyancy member fixed to the expandable member and contained within an internal cavity of the expandable member. The method of making includes: providing a mold having a shape of the buoyancy member integral with a shape of the expandable member; molding a wall of polymeric material over the mold; removing the molded wall of material from the mold; inverting a molded buoyancy member portion of the wall into an internal cavity defined by a molded expandable member portion of the wall; and sealing a slit remaining from the inverting.

An anchoring frame deployment tool is provided that includes: a recess or cavity formed in a distal portion shaped and dimensioned to receive an anchoring frame therein; needles and a driving mechanism for driving the needles through the distal portion and the anchoring frame; wherein the needles have sufficient length to extend through an abdominal wall of a patient and out through the skin of the patient when the anchoring frame is contacted to an inner wall surface of the abdominal wall.

An anchoring frame for anchoring a device to an internal structure in a patient's body is provided, including: a plurality of beams linked to be compressed into a narrow configuration and expanded to an expanded configuration; and a mechanical linking feature on each of at least two of the beams, the mechanical linking features configured to mechanically engage with mating features on the device.

An assembly of mating engagement members for engaging an intra-abdominal, extra-gastric implant device with an anchoring frame is provided, wherein the assembly includes: a rail having a series of transversely placed openings along a length thereof; a channel configured to receive the rail and having at least one detent configured to pass through a wall of the rail through one of the openings; and an actuator for preventing the at least one detent from passing through the wall when in a first configuration; and allowing passage of the at least one detent through the wall when in a second configuration.

In one embodiment, a fluid access port with a proximal end and a distal end is described, the proximal end operable to be accessed for fluid injection and the distal end operable to receive fluid and deliver it to a fluid receiving structure in a patient. The fluid access port comprises a pressure sensing system constructed to be handheld wherein the pressure sensing system is hydraulically coupled to the fluid access port and wherein the pressure sensing system comprises a pressure sensor and a circuit operable to receive a pressure related signal from the pressure sensor and generate an output signal. In other embodiments, the pressure sensing system of the fluid access port further comprises a physically connected power source. In other embodiments, the fluid access port comprises a pressure sensing system which is rigidly coupled to the fluid access port. In other embodiments, the fluid access port comprises a pressure sensing system which is constructed so as to be implanted in a patient. In other embodiments, the pressure sensing system of the fluid access port is placed within a moisture proof and biocompatible package. In yet other embodiments, the pressure sensing system of the fluid access port is coupled to the fluid access port through a needle placed through the skin of a patient. In other embodiments, the fluid access port further comprises a circuit which comprises a transmitter capable of transmitting data through the abdominal wall of a patient. In other embodiments, the circuit of the pressure sensing system further comprises a microcontroller which is programmed to power on and power off between pressure samplings. In yet other embodiments, the circuit of the pressure sensing system comprises an inductive circuit operable to transmit and receive electrical energy across the skin of a patient. In other embodiments, the fluid access port comprises a pressure sensing system which is reversibly attachable to the fluid access port when the fluid access port is implanted in a patient and the pressure sensing system is external to the patient. In another embodiment, the fluid access port of claim 1 further comprises an elongate tube with a proximal end and a distal end, the proximal end arising from the pressure sensor and containing a fluid wherein the fluid is inert at least to the pressure sensor and the material of the elongate tube; a protective material coupled to the distal portion of the elongate tube, the protective material inert to the inert material inside the elongate tube; and, wherein the combination of the inert material inside the elongate tube and the protective material at the distal end of the elongate tube maintain hydraulic continuity between the access port and the pressure sensor.

In another embodiment, a system to manage a surgical implant is described comprising a receiver constructed so as to communicate with a pressure sensing system hydraulically coupled to an implant, the receiver further configured to output information to a software program. The management system can further be configured so that the receiver is chosen so as to receive a signal transmitted wirelessly. The management system can further contain a pressure sensing system which is external to a patient. The pressure sensor in some embodiments can be internal to the patient or external to the patient. In some embodiments, the software comprises a patient algorithm and in some embodiments, data from the algorithm is used in combination with the acute data from the pressure sensing system. In some embodiments, the system to manage the patients' logs the usage information related to transmitting data to the receiver.

In some embodiments, a system to manage an implant comprises a sensing system coupled to the implant, a polymeric actuator hydraulically coupled to the implant and a microcontroller which interprets a signal from the sensing system and sends a signal to the actuator.

A Method for treating a patient comprising the steps of: penetrating the skin of the abdominal wall and entering the abdominal cavity; contacting an intra-abdominal structure with a first guiding device comprising a contact portion and a connecting portion; guiding a first surgical device over the first guiding device; and contacting the external surface of the first intra-abdominal structure with the first surgical device; the first surgical device can also comprise an electrocautery device; the first surgical device can further comprise a device to visualize the first intra-abdominal structure. The method can further comprise a surgical device with an undeployed configuration and a deployed configuration. The first surgical device can be a balloon. The balloon can be constructed so that its shape in the deployed configuration conforms to the region of the stomach close to the gastroesophageal junction. The shape of the balloon can be such that it surrounds at least half of the circumference of an external cross-section of the stomach when the balloon is in its deployed configuration. In some embodiments, the shape of the balloon can be such that it surrounds at least three quarters of the circumference of an external cross-section of the stomach when the balloon is in its deployed configuration. In another embodiment, the connecting portion further comprises a fastener. The fastener can be used to fasten the surgical device or balloon to the first abdominal structure. The first surgical device is an expandable device in some embodiments. In some embodiments, the expandable device can be a retractor and can be placed between the liver and stomach to create a working space between the liver and the stomach. In other embodiments, a second guiding device is passed through the skin, the second guiding device comprising a second contacting portion and a second connecting portion, and into the abdomen; the second guiding device is placed in contact with the external surface of a second intra-abdominal structure. This embodiment further comprises guiding a second surgical device over the second connecting portion, and contacting the external surface of the second intra-abdominal structure with the second surgical device.

In another embodiment, a second surgical device is guided over a first guiding device. This embodiment can further comprises injecting a tissue bulking agent into the external surface of the first abdominal structure. These methods can further be used to apply electrical stimulation with the first surgical device.

In another embodiment, a method to treat an obese patient is described which comprises: penetrating through the abdominal wall of a patient with a balloon adapted to track over a connector, wherein the balloon is expandable from a first undeployed configuration to a second deployed configuration, and wherein the balloon is fixed to a least two points inside the abdomen and wherein the balloon is further contoured to maintain contact with the gastrointestinal organ.

In another embodiment, a method of treating an obese patient is described and comprises advancing a guiding device through the skin of a patient and through the abdominal wall to contact an external surface of an intra-abdominal structure; applying a surgical device over the guiding device to contact the external surface of the intra-abdominal structure; applying a second device over the guiding device to lock the surgical device in place along the guiding device; and activating the surgical device via the guiding device.

In other embodiments, a device for application to the external stomach surface of a patient comprising a first portion expandable from a collapsed state to an expanded state, a second portion coupled to the first portion contoured to fit an external portion of the stomach without encircling the stomach, a third portion coupled to the device which is slideable over a flexible connector comprising a proximal end and a distal end. The device can have a first portion which is a balloon. The device further can comprise a fluid communication line in contact with said balloon. The device wherein said communication line and said connector are the same structure. In another embodiment, said first portion of the device and said second portion of the device are one in the same. The device wherein the second portion has a radius of between 0.25 and 5 centimeters and is curved to fit the cardia of the stomach when the first portion is in its expanded state. The device wherein the second portion is between 5 and 30 centimeters. The device wherein the connector further comprises an anchor at its distal end. The device can further contain a sensor.

In one embodiment, a system is described comprising a device expandable from a first configuration to a second configuration wherein said device is contoured to partially surround a portion of the stomach without fully circumscribing the portion of the stomach; a connector coupled to said device and operable to adjust the degree of expansion between the first configuration and the second configuration; A port in communication with the connector said port operable to be accessed intermittently through the skin of a patient. The system further comprises at least one sensor which senses a force applied to the device. In another embodiment, the system comprises an actuator; in yet another embodiment, the system further comprises a fastening element attached between the device and outer layer of the stomach.

In another embodiment, a device to apply external compression to the stomach comprises a first structure with a first width and a second smaller width wherein the structure is constructed to bias toward the second smaller width unless a force is applied to maintain the first width. A second structure is attached to the first structure and constructed from a material which enables force to be applied to adjust the width of the first structure. In another embodiment, the device comprises a second structure which is a fluid fillable structure. In another embodiment, the first or second structure of the device comprises nitinol. In other embodiments, the first or second structure comprises an electroactive polymer. In further embodiments, the device further comprises a communicating line. In other embodiments, the communicating line is a fluidic communicating line. In further embodiments, the communicating line is an electrical communication line. In other embodiments, the device comprises at least one sensor or an electroactive polymer. In still further embodiments, the device further comprises a power supply and/or a microcontroller.

In another embodiment, a system comprises a flexible connector with a proximal and a distal end and a tissue interface at its distal end. The tissue interface is operable to grasp tissue or anchor in tissue. A device to treat obesity is provided which is operable to be pushed along the flexible connector. The device to treat obesity can be operable to be pushed along a connector by a grasping instrument, the grasping instrument also operable to be pushed along the connector. The device to treat the stomach can be a stimulation device or the device can be a compression device. In some embodiments, an enabling device to perform surgery on the stomach is provided which is operable to slide along the connector and perform a surgical task. In one embodiment, the surgery enabling device is an energy generating or energy conducting device. In another embodiment, the surgery enabling device is a camera. In another embodiment, the surgery enabling device is an injector operable to inject a fluid into the wall of a gastric or esophageal lumen.

A device for application to the external stomach surface of a patient comprising a first portion expandable from a collapsed state to an expanded state, a second portion coupled to the first portion contoured to fit an external portion of the stomach without encircling the stomach, a third portion coupled to the device which is slideable over a flexible connector comprising a proximal end and a distal end. The device wherein the first portion is a balloon. The device further can comprise a fluid communication line in contact with the balloon. The device wherein said communication line and said connector are the same structure. In another embodiment, said first portion of the device and said second portion of the device are one in the same. The device wherein the second portion has a radius of between 0.25 and 5 centimeters and is curved to fit the cardia of the stomach when the first portion is in its expanded state. The device wherein the second portion is between 5 and 30 centimeters. The device wherein the connector further comprises an anchor at its distal end. The device can further contain a sensor

In one embodiment, a system is described comprising a device expandable from a first configuration to a second configuration wherein said device is contoured to partially surround a portion of the stomach without fully circumscribing the portion of the stomach; a connector coupled to said device and operable to adjust the degree of expansion between the first configuration and the second configuration; a port can communication with the connector, the port operable to be accessed intermittently through the skin of a patient. The system further comprises at least one sensor which senses a force applied to the device. In another embodiment, the system comprises an actuator; in yet another embodiment, the system further comprises a fastening element attached between the device and outer layer of the stomach.

In another embodiment, a device to apply external compression to the stomach comprises a first structure with a first width and a second smaller width wherein the structure is constructed to bias toward the second smaller width unless a force is applied to maintain the first width. A second structure is attached to the first structure and constructed from a material which enables force to be applied to adjust the width of the first structure. In another embodiment, the device comprises a second structure which is a fluid fillable structure. In another embodiment, the first or second structure of the device comprises nitinol. In other embodiments, the first or second structure comprises an electroactive polymer. In further embodiments, the device further comprises a communicating line. In other embodiments, the communicating line is a fluidic communicating line. In further embodiments, the communicating line is an electrical communication line. In other embodiments, the device comprises at least one sensor or an electroactive polymer. In still further embodiments, the device further comprises a power supply and/or a microcontroller.

In one embodiment, a method for approximating body lumens comprising penetrating through a first wall of a first gastrointestinal organ with an elongate structure comprising at least two expandable elements slideable along the elongate structure, penetrating through a second gastrointestinal organ with the elongate structure expanding a first expandable element of the elongate structure adjacent a first wall of the first gastrointestinal organ, expanding a second expandable of the elongate structure adjacent a second wall of the second gastrointestinal organ, and urging the first and second gastrointestinal organs together.

In some embodiments, the methods further comprise positioning a material between the first and second gastrointestinal organs. The methods can further include creating pressure between the first expandable element and the second expandable element. The method of this embodiment can further involve applying energy to the region between the first and second gastrointestinal organs. The elongate structure can further be flexible. In some embodiments, the elongate structure can further comprise one, two, three, or more than three lumens therethrough.

In another embodiment, the elongate structure comprises an element slideable along said elongate structure. In some embodiments, one expandable element is expandable independently of the other expandable element.

In some embodiments, methods include locking one expandable element on the elongate structure or locking one lumen of the elongate structure with respect to the other lumen or lumens of the elongate structure. In one embodiment, the methods further include measuring tension along the elongate structure while locking the expandable element or elements with respect to the elongate structure or locking one lumen of the elongate structure relative to the other lumen of the elongate structure.

In other embodiments, methods further include placing an adhesive material between the first and second gastrointestinal organs while in the urged position. In further embodiments, methods include applying a light absorbing material between the first and second gastrointestinal organs. In still further embodiments, the methods include applying a coherent light source to the region between the first and second gastrointestinal organs with or without a material in between the organs; other embodiments include applying a non-coherent or an LED light source to the region between the two organs.

In some embodiments, one or more anchors is expanded with a fluid or gas. In other embodiments, the connector and/or one or more of the expandable elements are produced from a magnetic, paramagnetic, or ferromagnetic material.

In some embodiments, a fluid access port is described which comprises an inflow and an outflow component, an access region for percutaneous access with a needle, and an attached material configure to improve contrast to an ultrasonic imaging device.

In some embodiments, a fluid access port comprises an attached material in the form of a continuous or discontinous ring around the fluid access port. The fluid access port can comprises a material in the gas phase. The material of the fluid access port can further comprise a liquid phase.

In some embodiments, an electrode for implantation in the stomach of a patient comprises a flexible conducting material containing pores sized to induce tissue ingrowth. In some embodiments, the flexible conducting material comprises two different materials constructed as a composite structure. In some embodiments, the electrode comprises two different materials: 1) a current conducting material; 2) a tissue ingrowth material. The electrode can further be of a size greater than 3 cm in length and greater than 1.0 cm wide. The electrode of can further contain pores sized between 10 and 250 microns in at least one dimension. The electrode can further contain pores which are between 10 and 100 microns in at least one dimension. In some embodiments, the electrode contains pores which are greater than 50 microns in the largest dimension. In other embodiments, the electrode contains pores which are between 5 and 100 microns in at least one dimension.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A-1E are perspective views of embodiments of the posterior anchor and connector.

FIGS. 1F and 1G are side views of an inflatable embodiment of posterior anchor and connector.

FIGS. 1H, 1I, and 1J are views of suture-connector—posterior anchor combinations in which the connector is separable from the posterior anchor.

FIG. 1K is a depiction of the continuous form of a posterior anchor.

FIG. 1L is a view of a connector-anchor combination in which the length between two anchors is adjustable.

FIGS. 2A and 2B are a perspective view and top view of one embodiment of an anterior anchor, respectively.

FIGS. 2C and 2D are side sectional views of the embodiment of the anterior anchor of FIGS. 2A and 2B, taken along the line B-B in FIG. 2B, in its deployed and reduced profile configuration, respectively.

FIGS. 2E and 2F are side sectional views of another embodiment of an anterior anchor, taken along the same line as FIGS. 2C and 2D, in its deployed and reduced profile configuration, respectively.

FIGS. 2G is a perspective view of an inflatable embodiment of an anterior anchor.

FIGS. 2H and 2I are side sectional views of the embodiment of the anterior anchor of FIG. 2G, taken along the line D-D in FIG. 2G, in its deployed and reduced profile configuration, respectively.

FIG. 3A is a perspective view of another embodiment of an anterior anchor.

FIGS. 3B and 3C are perspective views of the embodiment of the anterior anchor shown in FIG. 3A in its reduced profile and deployed configuration, respectively.

FIG. 3D is a perspective view of another embodiment of an anterior anchor.

FIGS. 3E-I detail the use of the connectors and anchors to facilitate the connection of two body lumens.

FIGS. 4A and 4A′ are a side and blow-up view, respectively, of one embodiment of a tissue grasping instrument with the distal end in its open configuration.

FIGS. 4B and 4B′ are a perspective and blow-up view, respectively, of the tissue grasping instrument of FIG. 4A with the distal end in its closed configuration.

FIGS. 4C and 4C′ are a perspective and blow-up view, respectively, of another embodiment of the tissue grasping instrument with the distal end in its closed configuration.

FIGS. 5A is a side view of one embodiment of an anchor implantation instrument.

FIG. 5B is a perspective view of the distal end of the anchor implantation instrument of FIG. 5A and an anterior anchor and connector.

FIG. 5C is a side sectional view of the distal end of the anchor implantation instrument of FIGS. 5A and 5B, taken along line C-C in FIG. 5B, with the anterior anchor in its reduced profile configuration.

FIG. 6A illustrates the first step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with the instrument of FIG. 4 inserted into the patient's abdomen through a laparoscopic port.

FIG. 6B illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with the instrument of FIG. 4 grasping the posterior wall of the stomach and a needle being inserted into the potential space of the lesser peritoneal sac.

FIG. 6C illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with the instrument of FIG. 4 grasping the posterior wall of the stomach and a posterior anchor and connector deployed in the expanded potential space of the lesser peritoneal sac.

FIG. 6D illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with a posterior anchor and connector deployed in the expanded potential space of the lesser peritoneal sac, with the connector passing out of the patient's abdomen through a laparoscopic port.

FIG. 6E illustrates an alternative step and device to place the posterior anchor in which the posterior anchor is brought behind the stomach before the connector is attached.

FIG. 6F illustrates the steps in the methods to perform percutaneous surgery on the stomach.

FIG. 7A illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with the instrument of FIG. 5C placing an anterior anchor in the patient's abdomen adjacent to the anterior wall of the stomach.

FIG. 7B illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen with an anterior anchor in its deployed configuration on the connector, with the anterior and posterior walls of the stomach urged together.

FIG. 7C illustrates the next step in one embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen after the connector has been cut flush with the anterior anchor.

FIGS. 7D-E illustrates a transgastric fastening assembly placed in a position to close a fascial defect from a laparoscopic port.

FIG. 8A illustrates an embodiment of a method of reducing the volume of the stomach. Shown is a side sectional view of a patient's abdomen after two posterior anchors and connectors have been deployed adjacent to the posterior wall of the stomach, with the connectors passing out of the patient's abdomen through laparoscopic ports.

FIG. 8B shows the connectors of FIG. 8A with clamps placed on the connectors outside the patient's body to temporarily hold the connectors in a test position.

FIG. 9 is a perspective view showing three transgastric fastening assemblies deployed longitudinally in a patient's stomach.

FIG. 10A illustrates one embodiment of a method for deploying a volume displacing device in the stomach. Shown is a side sectional view of a patient's abdomen after an uninflated balloon anchor has been inserted inside the patient's stomach with a connector passing out of the stomach, through the anterior stomach wall, and through a laparoscopic port.

FIG. 10B illustrates one embodiment of a method for deploying a volume displacing device in the stomach. Shown is a side sectional view of a patient's abdomen with the balloon anchor in its deployed position, held in place by an anterior anchor and connector.

FIG. 11A illustrates a volume displacing device which resides outside the stomach and is shown in an undeployed state.

FIG. 11B illustrates a volume displacing device which resides outside that stomach and is shown in a deployed state and adapted to the contour of the stomach.

FIG. 11C illustrates a volume displacing device which resides outside the stomach and is fixed to the anterior wall of the stomach and to the abdominal wall with an anterior anchor and connector.

FIG. 11D is a cross-sectional view of an extragastric restriction device which does not fully circumscribe the stomach and which optionally has two components, one of which can apply an inward force to the second component.

FIG. 11E is a mesh structure which partially or fully surrounds the stomach and can be combined with or without rigid structures and balloons.

FIG. 11F is cross-section of an extragastric restriction device with two components

FIG. 11G is an extragastric restriction device with a flexible catheter running through its center, an optional tissue adhesion facilitating device, and a tissue anchor at its distal end.

FIG. 11H is a representative example of an extragastric balloon which contacts a substantial portion of the exterior surface of the stomach.

FIG. 11I is a representation of a method to implant an extragastric expandable device using a connector contacting the stomach, a balloon adapted to slide a balloon along the wire, and optional second surgical devices positioned along the wire.

FIGS. 12 a-c illustrate the steps in the laparoscopic method of placing a device in the stomach where the transgastric connector attaches a suture to a posterior anchor.

FIGS. 13 a-b illustrate another step in the laparoscopic procedure in which the anterior anchor is urged toward the posterior anchor over a connector.

FIGS. 14 a-c illustrate another step in the laparoscopic procedure in which the anterior and posterior walls of the stomach are urged together and the connector and the transgastric suture are cut flush with the anterior anchor.

FIGS. 15 a-b illustrate the placement of a continuous posterior anchor in the laparoscopic procedure.

FIGS. 15 c-d depicts a horizontal row of transgastric anchors and connectors after their placement in the stomach.

FIGS. 15 e-g depicts a configuration where both the anterior and posterior fasteners are connected by a continuous mesh implant.

FIGS. 15 h-i depict a transgastric device with an adjustable, expandable structure inherent to the device

FIG. 16 depicts anchors of the present invention being used to secure an endoscopically placed gastric implant.

FIG. 17 a depicts a transgastric anchor assembly with afferent, efferent, and device end-effector pathways.

FIG. 17 b depicts a constricting band with afferent and efferent feedback pathways.

FIGS. 18 a-d depicts various configurations of constricting bands with various sensor configurations.

FIG. 18 e depicts an electrical schematic of a pressure sensing system configured to fit inside a percutaneous port.

FIG. 18 f depicts a patient management algorithm based on the pressure sensing system in the port.

FIG. 18G depicts another embodiment of a pressure sensor retrofit in which the sensor communicates with the line from the port but is a separate device from the port.

FIG. 18H depicts another embodiment of a fluid receiving and transmitting port in which a visualization rim is shown and a customized pressure sensing system is shown attached.

FIG. 18I depicts a handheld external system for detecting pressure from an implanted device.

FIG. 19 depicts a surgical anastomosis outfitted with a sensory feedback system.

FIG. 20 depicts a preferred embodiment of a gastroplasty device with a central stoma and a feedback system for stimulation.

FIG. 21 depicts a schematic of a control system for a gastric restriction device.

FIG. 22 depicts another schematic of a control system configuration with the surgical procedure as the center of the control system including sensory devices.

FIG. 23 depicts a clinical patient management system based on sensing parameters from surgical devices.

FIG. 24 depicts an extragastric device implanted in the abdomen of a patient.

FIG. 25 depicts a method of implanting an extragastric device in the abdomen of a patient.

FIG. 26 depicts and embodiment of an extragastric device and an associated method of implantation in the abdomen of a patient.

FIG. 27 depicts an extragastric device in its operative position after implantation.

FIG. 28 depicts data resulting from implantation of an implantable pressure sensor in combination with a Lap-Band and in a dog model.

FIG. 29 depicts an image obtained from a fluoroscopy machine during 30 day follow up of an extragastric balloon implantation.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Anatomy of the Stomach

The region behind the stomach is referred to as the lesser peritoneal sac. It is a potential space between the retroperitoneum and the posterior wall of the stomach. The proximal limit of the lesser sac is the cardia of the stomach and the distal limit is the pylorus of the stomach; the superior limit is the liver and the inferior limit is the inferior border of the stomach. To the left of the midline, the posterior wall of the stomach is generally free from the peritoneal surface of the lesser sac and to the right of the midline, the posterior wall of the stomach is more adherent to the peritoneum of the lesser sac although the adherence is generally loose and the adhesions can be broken up rather easily with gentle dissection.

The stomach is comprised of several layers. The inner layer is the mucosa. The next layer is the submucosa followed by the outer muscular layers. Surrounding the muscular layers is the serosal layer. This layer is important with regard to implants and healing because it is the adhesive layer of the stomach; that is, it is the layer which, when breached, heals with scar tissue formation. Implants adhering to this layer are less likely, or not likely, to migrate into the stomach whereas implants only placed in the mucosal or submucosal layers will migrate. Reference to “stomach wall” or “wall of the stomach” as used herein include the entire thickness of the stomach, including the mucosa, submucosa, muscular layers, and serosa. The “anterior wall of the stomach” is the portion of the stomach closest to the muscular abdominal wall and the “posterior wall of the stomach” is the part of the stomach closest to the retroperitoneum.

“Transgastric fastening assembly” or “fastening system” refers to a permanent or semi-permanent implant and comprises at least one posterior anchor, at least one anterior anchor, and a connector to couple the posterior and anterior anchors. “Fastener” and “anchor” have their ordinary meaning and are used interchangeably in this disclosure. The “connector” can refer to any means of connection including but not limited to a material connection, an electromagnetic or magnetic connection, or a chemical connection. As used herein, a “connector” is a coupler or linker used to materially connect the anterior and posterior anchors. As used herein, the “posterior anchor” is the anchor in a preferred embodiment which is adjacent to the posterior wall of the stomach when deployed. The “anterior anchor” is the anchor in a preferred embodiment which is approximated to the anterior wall of the stomach when deployed.

As used herein and when referring to portions of a surgical instrument, “proximal” refers to the end of the instrument which is closest to the surgeon when the instrument is used for its intended purpose, and “distal” refers to the end of the instrument which is closest to the patient and when the instrument is used for its intended purpose. When used to refer to the gastrointestinal tract, “proximal” is toward the mouth and “distal” is toward the anus.

“Laparoscopic procedure” broadly refers to procedures which require pneumoperitoneum and general anesthesia. “Percutaneous procedure” broadly refers to surgeries which do not require general anesthesia or pneumoperitoneum. These broad terms are mutually exclusive for the purposes of the ensuing invention because the respective procedures require different levels of patient preparation and peri-operative treatments and therefore define specific embodiments. Similarly, “endoscopic procedure” refers to procedures that are performed entirely with an endoscope. In some descriptions, the terminology “percutaneous means” is used which generically refers to placing a surgical instrument through the skin of a patient and using the surgical instrument to accomplish a surgical task; in this more generic case, “percutaneous means” can be used with or without laparoscopic means and in laparoscopic procedures. Similarly, “laparoscopic means” generically refers to procedures performed under the guidance of an internal camera placed through the abdominal wall (that is, percutaneous means); in this more generic sense, laparoscopy can be used with or without percutaneous methodology though in most cases percutaneous means are a requirement for laparoscopic procedure. Similarly, endoscopic means refers to procedures involving some level of endoscopic visualization but is not completed with the endoscope alone whereas “endoscopic procedure” refers to a procedure performed entirely through an endoscope. “Surgery,” “surgical procedure,” and “surgically created” have their ordinary meaning and with regard to the inventions herein, is all-encompassing, and refers to laparoscopic surgery, open surgery, endoscopic surgery, and percutaneous surgery.

“Patient afferent pathway” refers to a pathway which transmits a signal to the sensorium of a patient; for example, the vagus nerve carries afferent fibers to the hypothalamus and pain centers of the brain. “Patient end-effector pathway refers to a pathway which directly effects a result in an end-organ; for example, stimulation of contraction in the stomach. Patient efferent and end-effector pathways can overlap and therefore, the terms should not be considered mutually exclusive; for example, stimulation of the stomach likely stimulates some nerve fibers that travel to the sensorium and stimulation of the vagus nerve likely stimulates the stomach. “Device afferent pathway” refers to a pathway which transmits a sensory signal to a restriction device; for example, a sensor which senses food intake transmits its signal to the restriction device through a device afferent pathway. “Device efferent pathway” refers to a pathway which transmits a signal from a restriction device to a separate structure (e.g. a device end-effector pathway described below) or device (e.g. patient afferent pathway, a patient end-effector pathway, or a device end-effector pathway). A “device end-effector pathway” is a signal that directly effects a device state; for example, the connector of a transgastric assembly is shortened or the diameter of a restriction band undergoes a change in its diameter size.

“Exogenous gastric feedback loop” or “exogenous satiety pathway” refer to implantable systems which enhance the biologic pathways which already exist in a patient (the endogenous feedback systems). For example, the VBG and the Lap-Band™ both “tell” the patient that he/she is “full,” and consequently to stop eating. They induce a feeling of satiety through dilation of the stomach proximal to the device (this is an example of an endogenous satiety pathway). Exogenous or enhancement of these pathways refers to embodiments in which the satiety signal can be controlled and/or enhanced. For example, a sensor can be place on a restriction device and then a pathway, such as vagal nerve stimulation, can be activated in response to feedback from the sensor; therefore, satiety is induced at an earlier stage than if the endogenous feedback systems (stomach dilation) were relied upon.

“Gastric volume reducing devices, procedures and systems” and “gastric restriction devices, procedures and systems” have their ordinary meanings and overlap in meaning when the walls of the stomach are brought closer together. In these cases, all volume reducing procedures and restriction procedures which bring the walls of the stomach closer together necessarily overlap in meaning. “Gastric restriction devices” refer generally to any devices which restrict the stomach in some way. Included (but not limited to) are devices such as transgastric fastening assemblies, laparoscopic bands (e.g. the Lap-Band™), and intragastric balloons.

“Constricting bands” or “restricting bands” have their ordinary meaning and also refer to gastric restriction devices which surround the proximal region of the stomach. The constricting bands cause weight loss by restricting the food intake of the patient. In many cases, the restricting bands are adjustable balloons which are adjustable percutaneously by way of a port implanted at the time of surgery. These bands rely on the patient to inform the surgeon about eating habits and discomfort which may limit their utility because the patient can “cheat” themselves. Furthermore, the monthly or so follow up visits are potentially too infrequent to be useful. “Gastric restriction system” refers broadly to the restricting devices including both adjustable bands and devices such as transgastric fastening assemblies.

Buoyancy is a physical principle and can be defined as the tendency or capacity to remain afloat in a liquid or rise in air or gas. A device which is less buoyant than its surroundings will tend to sink and a device which is more buoyant than its surroundings will tend to float relative to its surroundings. A composite device can be more or less buoyant than its surroundings depending on the components of the composite. In some devices, buoyancy is adjustable. For example, a balloon filled with one fluid such as a liquid would tend to sink or be negatively buoyant in a surrounding fluid whereas the same balloon filled with another fluid such as a gas would tend to be positively buoyant in a surrounding fluid. In one example, the device is filled partially with gas and partially with liquid in which case it would tend to be positively buoyant relative to its surroundings depending on the amount of gas. Some devices can be positively buoyant with a material such as a foam which traps a lot of gas inside. Some devices are more buoyant than their surroundings even though one portion of the device may be less buoyant than its surroundings. For example, a composite device with a metal mesh in combination with an inflateable balloon. In this example, the composite can be positively buoyant while the metal mesh itself would be negatively buoyant. Buoyancy is intimately related to density although buoyancy refers to a device in combination with its surroundings whereas density is an absolute measurement.

Furthermore, the following abstract presented at the 2007 SAGES meeting in Las Vegas, Nev. on Apr. 22, 2007 is incorporated into this disclosure. Associated slides and data are depicted in FIGS. 24-29.

ET012

-   -   STOMACH RESTRICTION WITH AN EXTRAGASTRIC BALLOON, Michael         Gertner MD, Stanford University The objective of this         developmental stage technology is development of a gastric         displacement device which resides between the stomach and the         abdominal wall. Because the implantation procedure does not         involve penetration of the gastic wall and the device does not         circumscribe the stomach and apply a high pressure, it is         anticipated that this device will ultimately have an improved         safety profile over the Lap-Band™. This device is implantable         with a modified PED procedure so that minimal ansthesia will be         required. The device was created by dipping a plypropylene mesh         into a medical grade silicone and then forming the balloon over         a semi-circular mold, implantation of the balloon was performed         by sliding the siliconized mesh over polypropylene sutures.         Position and restricting ability were confirmed with a barium         swallow. Pressure on the stomach is accomplished with the         balloon contracting the anterior portion of the stomach with         posterior support behind the stomach from the retroperitoneum.     -   Over a 5 week period, increasing amounts of saling were added to         the balloon reaching a maximum of 100 cc at week 4. At the         higher balloon volumes, restriction of the stomach was noteable         on barium swallow. At 35 days, the balloon was still in firm         position. At necropsy, a capsule was noted around the balloon         and there was no evidence of erosion of the mesh or the balloon.         The device was easily removable after entrance into its capsule.     -   Ongoing work involves larger animal trials, a longer follow-up         period, and miniaturization of the device.         Transgastric Fastening Assembly Referring to FIGS. 1A and 1B,         one embodiment of the posterior anchor 14 and connector 12 are         shown in a deployed configuration (FIG. 1A), and reduced profile         configuration (FIG. 1B). The connector 12 is preferably made of         a flexible, biocompatible polymer, but it can be made from         various kinds of suitable biocompatible materials known to those         of skill in the art including metals, such as titanium and         platinum, metal alloys, such as stainless steel,         nickel-titanium, and cobalt-chromium, man-made polymers, such as         polyurethane, silicone elastomers, polyglycolic acid, polylactic         acid, poly (C-caprolactone), polyvinylidene fluoride (PVDF),         PTFE, FEP, polypropylene, or natural fibers such as silk;         bioartificial materials include allogenic and xenogenic collagen         based products. These materials can be used singly or in         combination (when the connector has two distinct components as         opposed to one). For example, one portion of the connector may         be bioabsorbable and another portion of the connector may be         permanent; or, one part of the connector may be a sensor or         active component, and the other part a coating. The connector         can be continuous or discontinuous. The connector 12 can vary in         thickness, shape, and rigidity. For example, in the embodiment         shown in FIG. 1A, the connector 12 is substantially rod-shaped,         with a circular cross-section, and is flexible. Those of skill         in the art will recognize that the cross-section of the         connector can be any of a number of shapes, such as square,         hexagonal, oval, etc. In other embodiments, the connector 12 is         thin and flexible, such as a surgical suture, and in still         others it is rigid to like a guiding rail for an anchor which         travels over the rail. The connector can have a thickness         ranging from 100 microns (e.g. suture) to several millimeters         depending on the application. Although a single connector is         depicted as being attached to the posterior anchor, those         skilled in the art will recognize that more than one, or several         connectors can be connected to the anchor at different points on         the anchor or as a combination attached to one point on the         anchor (e.g. a bundle). In some embodiments, the connector is         made from a thermoresponsive material such as a thermoresponsive         polymer or metal such as shape memory alloy (e.g.         nickel-titanium alloy). In other embodiments, the connector is         composed of at least one material which conducts an electrical         current through from the anterior anchor to the posterior anchor         or from the posterior anchor to the anterior anchor.

In a preferred embodiment, the posterior anchor 14 is made from a biocompatible, radio-opaque, or magneto-opaque semi-rigid polymer; it can also be made from various kinds of suitable materials known to those of skill in the art including metals, metal alloys, plastics, natural materials or combinations thereof as discussed above in relation to the connector 12. In some embodiments, the anchor is made from a conductive material and in other embodiments the anchor is made from a combination of conducting, non-conducting, and/or semi-conducting materials. The posterior anchor 14 can be solid, or alternatively, can be porous, mesh-like, lattice-like, or umbrella-like. In some embodiments, the anchor contains a potential space on the inside which can be expanded by a fluid (e.g. gas or liquid). In a preferred embodiment, the posterior anchor is porous or has a porous mesh attached to it to encourage fibrous ingrowth such that it becomes permanently attached to the stomach or intestinal wall. Coatings can be added to the anchor to encourage tissue ingrowth; of course, such coatings do not limit the ability for the interior of the anchor to be a potential space for expansion by a fluid. In other embodiments, the posterior anchor is solid and/or treated to discourage tissue ingrowth (e.g. with a silicone coating). In other embodiments, the posterior anchor has a xenograft or allograft material attached to the anchor. In a preferred embodiment, the posterior anchor 14 is disc-shaped, but those of skill in the art will recognize that other embodiments are possible, such as those shown in FIGS. 1C and 1D, or disclosed in U.S. Patent Application Publication No. 2004/0122456 which is herein incorporated by reference; note particularly the description of anchor structures. The posterior anchor, in other embodiments, can be rectangular or diamond shaped. The posterior anchor can also be bioabsorbable in whole or in part in some embodiments. The largest dimension of the posterior anchor can range from less than 1 mm to about 15 cm depending on the application and the manner in which it is implanted (see below). In the case where the posterior anchor is a disc shape, the diameter is considered the largest dimension.

In the embodiment shown in FIGS. 1A and 1B, the connector 12 is fastened to the posterior anchor 14 at an attachment point 16 which is preferably a permanent, e.g. welded or molded, connection. Such a weld or connection can comprise, for example, a thermoformed polymer, a metallic weld, or a molded or other integral structure. In a preferred embodiment, a biocompatible thermoformed polymer is used because of its flexibility and ability to yield to the continuous motion of the stomach. More preferably, the connector and posterior anchor are produced as a single, continuous structure (e.g. through an injection molding process).

Other suitable means of fastening the connector to the posterior anchor are also contemplated and do not necessarily result in a connector and posterior anchor becoming permanently attached. For example, in one embodiment shown in FIG. 1C, one end of the connector is passed through a hole 20 near the center of the posterior anchor 22, and a stop 24, such as a knot or enlarged molded region, is formed on the end of the connector to prevent its passage back through the hole in the posterior anchor. In this embodiment, the posterior anchor 22 can be free to move along the length of the connector 26, but is prevented from being removed from one end of the connector by the stop 24.

In the embodiment shown in FIGS. 1A and 1B, the posterior anchor 14 preferably has a deployed configuration (FIG. 1A), and a reduced profile configuration (FIG. 1B). The posterior anchor 14 can be deformed to a folded configuration wherein its profile is reduced to facilitate insertion of the anchor through a laparoscopic port or through the walls of the stomach or other tissue as described in more detail below. In one embodiment, the posterior anchor 14 is made of a semi-flexible material having shape memory, so that once the anchor is deployed within the patient, it will return to its original shape shown in FIG. 1A, preventing it from being easily pulled back through the tissue. Preferably, the posterior anchor is inflatable in place of, or in addition to, having shape memory, which allows for a much larger deployed profile relative to its undeployed profile (see below). In one embodiment, the anchor can have both shape memory as well as inflateability in which case it can be made more or less buoyant than the surrounding tissue. For example, in one embodiment, the anchor can be inflated with a liquid, a liquid and a gas, or just a gas depending on the buoyancy desired within the system. In some embodiments, the shape memory is activated by passing a current through the material. In some embodiments, the posterior anchor contains an intrinsic magnetic, ferromagnetic, electromagnetic, piezoelectric, paramagnetic, magnetorheologic or other electrically or thermally adjustable material and can apply a force to another part or portion of the anchor assembly; for example, an electroactive polymer or a metal such as nitinol can be used. These materials can also serve as components of sensors (e.g. strain, pressure, tension, stress, accelerometry). In some embodiments, the posterior anchor contains electrodes placed at the surface of the material such that they integrate with the organ they contact (e.g. the stomach).

FIGS. 1D and 1E show an alternative embodiment of the posterior anchor 30 and connector 32 in a deployed configuration (FIG. 1D) and a reduced profile configuration (FIG. 1E). In this embodiment, the posterior anchor 30 is elongated, having major and minor dimensions, and preferably having a rod or bar shape. By aligning the connector 32 substantially parallel to the posterior anchor 30, its profile is reduced to facilitate insertion of the anchor through the walls of the stomach or other tissue. When the anchor leaves its surrounding sheath (see below), tension on the connector 32 in the direction of the arrow in FIG. 1E will urge the posterior anchor 30 into a substantially perpendicular orientation relative to the connector 32, as shown in FIG. 1D, preventing it from easily being pulled back through the tissue. The connection between the posterior anchor 30 and the connector 32 can be hinged. Alternatively, the connector 32 can be made of a semi-rigid material which is permanently connected or welded to the posterior anchor 30. If the connector is deformed to a bent position, shown in FIG. 1E, it will return to its original straight shape shown in FIG. 1D once the anchor is deployed within the patient, preventing the posterior anchor from easily being pulled back through the tissue. This anchor 30 can be inflatable as well, which allows for a much larger deployed profile relative to its undeployed profile.

In a preferred embodiment, shown in FIGS. 1F and 1G, the posterior anchor is inflatable. The anchor has an inflatable disc-shaped body 34 which is readily deformable when in its reduced profile (e.g., uninflated) configuration as shown in FIG. 1F. In the preferred embodiment, the posterior anchor body 34 is disc-shaped, but those of skill in the art will recognize that other embodiments are possible, such as those shown in FIGS. 1C and 1D, or in which the inflatable anchors are square shaped, rectangular, or amorphous, or have a shape disclosed in U.S. Patent Application Publication No. 2004/0122456 which is herein incorporated by reference; note particularly the description of anchor structures. The body can be inflated with a substance delivered through a hollow connector 35. When the interior space 36 of the anchor body is inflated, the anchor assumes its deployed configuration shown in FIG. 1G. Once the body is inflated, it can become substantially less compliant yet remain soft and pliable. The anchor can be inflated from its reduced profile to its deployed profile. The size of the reduced profile can be less than 1 cm or less than 5 mm and the size of the deployed profile can range from 1 cm to greater than 5 cm or greater than 10 cm. In the reduced profile, the anchor can fit into a conduit having a length inside the conduit which is longer than it width so as to fit through the conduit.

The inflatable posterior anchor can have a valve 38 located between the anchor body 34 and the connector 35. Alternatively, the valve is located in the portion of the connector located outside the patient, the valve (e.g. stopcock type valve) being controlled by the operator until the anterior anchor is placed (see below). In this alternative embodiment, the filling substance is trapped in the posterior anchor after the anterior anchor is deployed and the connector is cut and sealed, preferably flush with the anterior anchor (see below). The filling substance can be a gas, liquid, or material which changes phase with time (i.e. it may harden, cure, polymerize, or become a gel with time). Other materials such as magnetorheologic fluids (for example, magnetic particles immersed in an oil) can be used as well and such fluids would interface with the electrical systems described below. Preferably, the surface of the posterior anchor adjacent to the posterior wall of the stomach has a mesh fixed to it to encourage tissue ingrowth. In some embodiments, part or all of the anchor material is comprised of a biodegradable material.

In some embodiments, the anchor assembly and in particular the posterior anchor and connector combination are used for “extragastric volume reduction” of a region of the stomach (see below for more detail). In this embodiment, the posterior anchor can be adapted to be an extragastric restriction device and the anterior anchor-connector system is used for fixation of the device to the abdominal wall. In this embodiment, it may be desirable for the extragastric restriction device to have a shape that conforms to an area of the stomach such as the GE junction. The connector can serve as a conduit to fill the extragastric balloon and can further be equipped with a valve to fill the extragastric balloon and prevent leaking of its contents. The transverse width of the GE junction is typically 0.5 cm to 10 cm in almost the entire population and 1 cm to 5 cm in the majority of the population. The extragastric balloon should be shaped such that it can surround 180-270 degrees of the GE junction or from 90 degrees to 360 degrees. In some embodiments, the balloon can completely surround the GE junction and in these embodiments, the balloon can be continuous or discontinuous.

In some embodiments, the extragastic restriction device is filled with gas, liquid, a gel, or a combination of these fluids. As described below, the extragastric compression device can have multiple compartments and each can be filled with a gas, liquid, or a combination of liquids and gases.

FIG. 1H depicts another embodiment of posterior anchor of the current invention. The posterior anchor 37 and the connector 39 are separable in this embodiment. In one embodiment, the first connector has an inner diameter with a second connector (e.g. a suture) traveling through its lumen. A second connector 33 is disposed within the first connector 39. The second connector 33 can be one or more sutures for example. This fastening assembly would be used in a laparoscopic procedure where the connector 39 would be placed through an organ before engaging the posterior anchor 37. In some embodiments, the posterior anchor can be as large as the width of the organ (e.g. 8-10 cm in the case when the organ is the stomach). In some embodiments, the anchor 37 can be as small as 5 mm or 1 cm. The anchor 37 can also be adapted to accommodate several connectors (FIGS. 15 c-d) rather than one connector at a time. The first connector 39 is adapted to engage the posterior anchor 37 after passing through tissue (e.g. the stomach). After contact between the outer connector 39 and the posterior anchor 37, the outer connector 39 is removed, leaving the inner connector 33 (e.g. the suture or sutures) attached to the posterior anchor 37 (FIG. 1J). The connection of the suture to the posterior anchor is accomplished by any mechanical means well known to those skilled in the art.

FIG. 1L depicts another embodiment of the current invention in which the connectors 47 in this embodiment are configured so that their length or lengths is/are adjustable. In an example of this embodiment shown in FIG. 1L, the connector is split (e.g. two sutures are used). The housing 45 is attached to one half of the connector 47 and this half of the connector is attached to the posterior anchor 49. Within housing 45, the connector 47 can be shortened (and the tension between the two anchors increased) by turning inner cylinder 48 which changes the distance (and the tension on the connector) between the two anchors 49, 51. In another embodiment, a solenoid based motor system can adjust the pulley and change the length of the connector 47. Such adjustment can be done with an endoscope or can be done automatically with a wireless based transmitting system; in this embodiment, the implanted anchor assembly will have an integral source of power and a controller system. The adjustment can be done after (e.g. days, months, years) implantation of the fastening system within an organ such as the stomach.

Although FIGS. 1 a-l depict a single connector contacting the posterior anchor, those skilled in the art will recognize that more than one connector can be used to contact the posterior anchor. The more than one connector can be placed in any arrangement along the posterior anchor (e.g. in a row, in a pattern along the perimeter, or concentrated in the center). The more than one connector can be bundled and attached in one place on a second anchor or in multiple points on a second anchor. In the embodiments where the posterior anchor is an extragastric restriction device, the connectors fix the anchor to the abdominal wall with additional anchors with the abdominal wall fascia.

Other methods of introducing adjustability of the transgastric anchor assembly exist as well and are useful in some embodiments. For example, the suture can be produced from a material such as nickel-titanium alloy, the tension of which can be adjusted with an electrical current or other means of introducing a temperature increase in the alloy. In some embodiments below, the tension of the nickel-titanium alloy can be adjusted depending on an input parameter such as for example, the output from a sensor integral to a gastric restriction device (see below for more detail). In another embodiment, a nickel-titanium alloy is a novel component of a restricting band such as the Lap-Band™ (see below) or an extragastric restriction device which does not completely surround the stomach. In some embodiments, both a transgastric assembly and a restricting band are implanted in the patient and in some embodiments, the transgastric fastening assembly has an adjustable nitinol connector and in other embodiments, the restricting band has a nitinol ring which is adjustable via electrical means. In some embodiments both the transgastric anchor and the restricting band both have adjustable nitinol components. Alternative electroactive materials include electroactive polymers.

In any of the embodiments above, the connector can serve as a sensor to detect the tension imposed on it by the two fasteners moving in opposite directions. In embodiments where the connector serves as a sensor, the connector can be composed of one or more different materials. One of the materials can be a sensor or sensing material and the other serves as a material for mechanical strength. For example, a piezoelectric strain gauge can be used as a strain sensor as can an electroactive polymer. As discussed below, the connector (sensor) can serve as the afferent (device afferent) limb of a feedback loop. The efferent (device efferent) pathway of the feedback loop can be an electrical lead, which communicates with, and stimulates a pathway such as the vagus nerve (patient afferent pathway), a sympathetic pathway such as the celiac plexus, or a device efferent pathway which (for example) can adjust the degree of gastric volume reduction or restriction. When some or all of these efferent (neural and mechanical) pathways are stimulated, a feeling of satiety can be created and controlled in a patient. Such pathways may decrease or eliminate problems with constricting band and stapled gastroplasties because they offer solutions to decrease the amount of pressure applied by the devices to the stomach until the pressure is needed (when the patient is eating for example). Such methods and devices can potentially decrease the problems with erosion and reflux. Furthermore, the adjustment of the device can be taken out of the hands of the patient and controlled by the device and the surgeon. Furthermore, battery power can be conserved by apply electrical stimulation only when the patient is eating.

In an embodiment, the connector (or part of the connector) can take the form of a strain gauge in which a potential is generated which is proportional to the tension (stress) applied to it. The strain measurement in the connector can be transmitted wirelessly or through a wired connection to an effector limb (patient or device efferent pathway) of the circuit or to an external receiver. In other embodiments, the strain measurement is transmitted through a wired circuit (e.g. from the strain gauge directly to the efferent pathway of the feedback loop). In one example, the strain gauge is an electrically activateable polymer (electroactive polymer); in a separate embodiment, the efferent end of the feedback loop is also an electroactive polymer; in other embodiments, both the afferent and efferent limbs of the feedback system are made from electroactive polymers. In some embodiments, the efferent effector pathway is stimulation of the stomach wall surrounding the fasteners or the stomach wall in a place some distance away from the transgastric fastener assembly such as the peri-pyloric region. Stimulation of a patient end-effector (e.g. the stomach) pathway can be transmitted through the fastener itself or through a separately attached electrode.

In an alternative embodiment, the efferent limb of the feedback loop is an electrical lead which communicates with a cutaneous stimulator to negatively enforce excessive feeding behavior. In this embodiment, feedback to the patient is not necessarily a satiety signal but a cutaneous feedback signal which alerts the patient to an overfeeding state. In another embodiment, the feedback pathway is a computer algorithm which alerts the patient that they are overeating or saves the data until sometime in the future, then printing out the data for the patient or the physician. In other embodiments, the efferent limb of the feedback system generates loud sounds or vibrations.

The algorithm between the afferent and efferent pathway can be a simple one in which the efferent pathway has an on or off status depending on the level of stimulation from the afferent pathway. Alternatively, the relationship between the afferent and efferent pathways is non-linear. For example, as the strain increases, the efferent signal increases two- three- or fold. If the strain increases further, the efferent signal can increase in an exponential manner (for example, eight to ten-fold). Other patterns are possible as well and these patterns can be programmed into the controller or signal generator and represent the algorithmic aspects of the stimulation system. Nevertheless, the relationship between inputs and outputs of the system can be programmed from a location external to the devices and system (e.g. the surface of the patient or a remote location such as a physician's office).

FIGS. 2A (perspective view) and 2B (plan view) show an embodiment of the anterior anchor 40. The anterior anchor has a disc-shaped body 42 with a hole or other passageway 44 substantially in the middle of the body. Although the hole is shown in the center of the anchor, those skilled in the art will recognize that the hole can be placed anywhere along the face of the anterior anchor and/or more than one hole can be created in the anchor. Two or more gripping elements 46 project into the center of the hole or other passageway. With respect to the gripping elements, there can be as few as one or more than two. The gripping elements can circumscribe the entire opening or they can be discrete components like keys or ridges with a pitch 46. The gripping elements can be macroscopic as shown in FIG. 2A or they can be microscopic like sandpaper (not shown). The gripping elements may have teeth 50 angled toward the top surface of the anchor. Optionally, two hooks 52, or other graspable recesses, appendages, or structures, are located on the top surface of the anterior anchor. Hooks 52 allow for attachment of a surgical instrument during deployment of the anterior anchor in the patient as described below. Alternatively, there can be none, one, two or more than two graspable recesses, appendages, or structures on the top surface of the anchor. In the preferred embodiment, the anterior anchor body 42 is disc-shaped, but those of skill in the art will recognize that other embodiments are possible, as disclosed in U.S. Patent Application Publication No. 2004/0122456 which is herein incorporated by reference; note particularly the description of anchor structures. The anterior anchor (or the transgastric fastening assembly) can also be wholly comprised of or only partially comprised of one or more magnetic, magnetorheologic, or electromagnetic components. In these embodiments, an electric current is applied to the anchors which either causes attraction of the anchors (e.g. when the anchors contain electromagnets), or results in an increase in the viscosity within the anchors resulting in a resistance to the flow of food (magnetorheologic embodiment). Alternatively, in other embodiments, the anterior anchor (or the transgastric fastening assembly) carries one or more weights within it such that gravity causes the intestinal walls to come together (and provide a resistance to food) as a result of the weights within the anchors. In other embodiments, the anchor is made at least in part from an electroactive polymer.

FIGS. 2C and 2D are cross sections of the anterior anchor of FIGS. 2A and 2B taken along the line B-B in FIG. 2B. FIG. 2C shows the anterior anchor in its deployed configuration with the connector 12 of FIG. 1A passing through the hole or other passageway 44 in the body of the anchor. In the deployed configuration, the gripping elements 46 and teeth 50 engage the connector 12 with sufficient pressure to prevent movement of the anchor along the connector 12 in the direction of the arrow in FIG. 2C, which would increase the distance between the anterior anchor and posterior anchor (not shown). In the case where the connector is a suture, the surface of the suture can be roughened to enable gripping by the anchor. In FIG. 2D, the anterior anchor 40 is in its reduced profile configuration with the connector 12 of FIG. 1A passing through the hole or other passageway 44 in the body of the anchor. Preferably, the anterior anchor is made of a semi-rigid polymer which allows the anchor to be deformed into a substantially folded configuration illustrated in FIG. 2D. When in this configuration, the gripping elements 46 and teeth 50 do not significantly engage the connector 12. This allows movement of the anterior anchor 40 along the length of the connector 12 in the directions illustrated by the arrows in FIG. 2D. Once the anterior anchor is in the desired position along the connector 12, the anterior anchor is permitted to return to the configuration shown in FIG. 2C, and the gripping elements 46 and teeth 50 engage the connector 12, thus preventing movement between the connector 12 and the anterior anchor 40. Importantly as described above in some embodiments, the anterior fastener is slideable along the connector in a reversible fashion. For example, when the fastener is compressed to its undeployed configuration from its expanded configuration, the fastener can once again move (or be moved) along the connector. This feature may be a highly desirable one as it will allow for adjustability after deployment of the fastener because the process can be reversed and the fastener repositioned.

In an alternative embodiment, it is contemplated that the connector 12 can have notches 51, which interact with gripping elements 46 in a ratchet-and-pawl mechanism similar to that used in cable ties, providing a one-way adjustability, in which the posterior and anterior anchors can be moved toward each other, but not away from each other.

FIGS. 2E and 2F illustrate another embodiment of an anterior anchor 60 which is similar to the one illustrated in FIGS. 2C and 2D. In FIG. 2E, the gripping elements 62 and teeth 64 are oriented so that the anterior anchor can be deformed such that the top surface of the anchor is folded inward as illustrated in FIG. 2F. This is in contrast to the embodiment illustrated in FIG. 2D where the bottom surface of the anchor is folded inward. The teeth 64 in FIG. 2E are angled toward the top surface of the anterior anchor and engage the connector 12 of FIG. 1A such that they prevent movement of the anterior anchor along the connector 12 in the direction of the arrow in FIG. 2E, which would increase the distance between the anterior anchor and posterior anchor (not shown).

FIG. 2G is a perspective view of a preferred embodiment where the anterior anchor is inflatable. The anterior anchor is inflatable from a reduced state of approximately 5 mm or 1 cm to greater than 5 cm to greater than 10 cm. The anterior anchor has a hollow, inflatable disc-shaped body 65 with a hole or other passageway 66 substantially in the middle of the body to track the connector. Two gripping elements 67 project into the center of the hole or other passageway, although there can be as few as one or more than two gripping elements. The gripping elements can have teeth 68 angled toward the top surface of the anchor. Alternatively, in a preferred embodiment, the gripping elements are in the form of a rough surface rather than the protruding elements as shown in FIG. 2G. Such a surface, which may be a sandpaper-like surface, creates enough friction to prevent movement in either direction along the connector. Optionally, two hooks 69 are located on the top surface of the anterior anchor. Hooks 69 facilitate grasping by a surgical instrument during deployment of the anterior anchor in the patient as described below. Alternatively, rather than hooks, there can be one or more graspable protrusions on the body. In yet another embodiment, there are no hooks or graspable protrusions, and the body of the anchor is grasped directly to manipulate the anchor. In another embodiment, protrusions 69 are magnetic or otherwise sticky (e.g. Velcro) in nature to facilitate attachment to a surgical instrument.

An inflation tube 63 is used to inflate and deflate the anterior anchor. This inflation tube may or may not have a valve. In one preferred embodiment, the anterior anchor is filled with gas or fluid through the inflation tube and the fluid is held inside the anchor through an external (e.g. stopcock) valve controlled by the operator. When the inflation tube is cut at the end of the procedure, the inflation line is crimped closed thereby locking the inflating substance inside the anchor. Alternatively, the shears used to cut the inflation line can be metal and an electrocautery current can be applied through the shears and to the inflation line to weld it closed.

FIGS. 2H and 2I are cross sections of the anterior anchor of FIG. 2G, taken along the line D-D in FIG. 2G. The disc-shaped body 65 is readily deformable when in its reduced profile (i.e., uninflated) configuration as shown in FIG. 2I. The body can be inflated with a substance delivered through the inflation tube 63. When anchor body is inflated, the anchor assumes its deployed (i.e. inflated) configuration as shown in FIG. 2H with the connector 12 of FIG. 1A passing through the hole 66 in the body of the anchor. In the deployed configuration, the gripping elements 67 and teeth 68 engage the connector 12 with sufficient pressure to prevent movement of the anchor along the connector 12 in the direction of the arrow in FIG. 2H, which would increase the distance between the anterior anchor and posterior anchor (not shown). Alternatively, rather than defined gripping elements and teeth, the surface of body which defines the sides of the hole or other passageway 66 can be configured such that when the anchor body is inflated, the sides of the hole or other passageway expand to substantially close off the hole or other passageway and limit movement of the anchor relative to the connector through friction between the connector and the anchor.

In FIG. 2I, the anterior anchor 65 is in its reduced profile (i.e. uninflated) configuration with the connector 12 of FIG. 1A passing through the hole 66 in the body of the anchor. When in this configuration, the anchor body is readily deformable and the gripping elements 67 and teeth 68 do not significantly engage the connector 12. This allows movement of the anterior anchor 65 along the length of the connector 12 in the directions illustrated by the arrows in FIG. 2I. Once the anterior anchor is in the desired position along the connector 12, the anterior anchor is inflated by a filling substance delivered through the inflation tube 63 and the anchor assumes its deployed (i.e. inflated) configuration as shown in FIG. 2H; the gripping elements 67 and teeth 68 engage the connector 12, thus restricting movement of the anterior anchor 65 in one or both directions along the length of the connector 12. The filling substance can be a gas, liquid, or material which changes phase with time (i.e. it may harden, cure, polymerize, or become a gel with time). In some embodiments, the filler substance is a magnetorheologic fluid the viscosity of which can be changed with a magnetic field (e.g. it can be turned on or off).

FIG. 3A illustrates another embodiment of an anterior anchor 70 consisting of two parts, an anchor body 72 and a readily deformable collar 74. The anchor body and collar have a central hole or other passageway (76 and 78 respectively) through which the connector can pass. Preferably, the anterior anchor body is made of a semi-rigid polymer which can be deformed into a folded configuration with a reduced profile as illustrated in FIG. 3B. The collar can be referred to as a frame or anchoring frame in some embodiments. Preferably, the readily deformable collar 74 is permanently deformable; i.e., once deformed, it does not return to its original shape. As illustrated by the arrow in FIG. 3B, both the collar 74 and anchor body 72 can move along the connector 12 of FIG. 1A. Once the anchor body 72 is in the desired position, the collar or frame 74 is crushed, such that the collar 74 engages the connector 12 and can no longer move along the length of the connector 12. This prevents the anchor body 72 from moving along the length of the connector 12 in the direction of the arrow illustrated in FIG. 3C, which would increase the distance between the anterior anchor and posterior anchor (not shown). FIG. 3D illustrates an alternative embodiment of the anterior anchor 80, where the anchor body 82 and deformable collar 84 are a single piece.

In this method, the anchoring frame can be placed inside the abdomen to contact the stomach or abdominal wall. The frame can be passed over a connector, rail, or suture and the locked against the stomach or abdominal wall. The anterior anchor can comprise a material which is less compliant than another region of the anchor, leading to a directionality of movement as the anchor is inflated.

In a preferred embodiment, the anterior anchor is made from a biocompatible, radio-or magneto-opaque polymer, but it can also be made from various kinds of suitable materials known to those of skill in the art including metals, metal alloys, plastics, natural materials or combinations thereof as disclosed above; the anchor material can also be a biodegradable material. The anterior anchor can be solid, or alternatively, can be porous, mesh-like, umbrella-like or lattice-like.

In a preferred embodiment, the anterior anchor is porous, mesh-like, umbrella-like or lattice-like to encourage fibrous ingrowth such that it becomes permanently attached to the stomach wall. Coatings can be added to the anchor, or a mesh material such as polypropylene can be fixed to the anchor surface, such that it touches the anterior stomach wall and encourages tissue ingrowth. In other embodiments, the anterior anchor is solid and treated to discourage tissue ingrowth with materials such as silicone, PTFE, or FEP which are generally hydrophobic and non-reactive. In one embodiment, one side of the anchor is produced from PTFE and the other side of the anchor is produced from polypropylene. In other embodiments, the anterior anchor has a xenograft or allograft material attached to the anchor which can encourage tissue ingrowth. In a preferred embodiment, the anterior anchor is disc-shaped and substantially flat, but those of skill in the art will recognize that other embodiments are possible; for example, the anterior anchor can be elongate and/or continuous and can range in size from 5 mm to 10 cm, in which case, it can traverse the length or width of the stomach. As described below, this anchor can be used as an extragastric restriction device with one or more compartments or materials attached. Its buoyancy can be changed by these one or more materials or the buoyancy can be changed by different amounts and/or combinations of fluids within the anchor.

In some embodiments, a system is described in which the multiple anchors are connected by the connectors and the multiple anchors each have a characteristic buoyancy depending on the combination of materials and/or fillers inside. This configuration can add flexibility to the system as each anchor can be placed on different regions of the stomach. In some embodiments, the combination of anchors and connectors forms a ring around the stomach or traverse the stomach from anterior to posterior.

In some embodiments, the anterior anchors can have electrodes which can communicate electrically with a tissue (e.g. the stomach) after the anterior anchors are positioned in contact with the tissue (e.g. the stomach). The electrodes can pass through the material to communicate electrically with the connector traveling through the anterior fastener. The electrodes can communicate with other effector pathways (e.g. the vagus nerve or the muscle of the stomach) located at different anatomic regions from the anterior fastener. The electrodes can travel with or along the connectors, delivering current to the anchors or the tissue surrounding the anchors.

In any of the above embodiments, the anterior and posterior anchors as well as the connector can have one or more magnets (electromagnetic, paramagnetic, magnetorheologic, or ferromagnetic materials) disposed within or on their surfaces. Such magnet can serve a variety of purposes. In one example, the magnets serve as actuators to forcefully maintain the walls of the stomach together through their inherent and continuous (or discontinuous in the case of an electromagnet) magnetic interaction. In other embodiments, the magnets serve as sensors to sense the amount of food taken in by a patient; in this embodiment, a change in a magnetic field (relative movement of the magnets) is detected as an inductive current and can be correlated to food intake. Such sensing mechanisms are well known in the mechanical arts. In another embodiment, the anchors contain a magnetorheologic fluid which can respond to an electrical current. When stimulated with a magnetic field, the magnetorheologic fluid will undergo a change in viscosity and create a more or less compliant anchor or connector. In this embodiment, once electrically charged, the increase in viscosity will enhance the effect of the anchors in creating restriction or volume reduction (or both) of the stomach (for example).

Creation of an Anastomosis Between Two Body Lumens

The above devices and methods can further be adapted to create a connection or an anastomosis (such as a gastrojejunostomy, jejunojejunostomy, or ileocolostomy) between two body lumens. A gastrojejunostomy is the major anastomotic component of the Roux-n-Y bypass procedure, the jejunojejunostomy being the second component. FIGS. 3 e-g depicts the cardia and fundus 88 region of a stomach. An elongate tube, commonly referred to in the medical arts as a nasogastric tube 90, is adapted to serve a similar function to the connectors described above, the “nasogastric connector”; the nasogastric tube can further have one or more independent lumens 100 which are fixed or translateable with respect to the other lumen 90 or lumens 100 and then fixable with respect to the other lumens. The proximal end of the elongate tube is accessible to an operator outside a patient and the distal end of the elongate tube is manipulateable via the proximal end of the elongate tube 90.

The lumens (90, 100) can communicate with expandable elements or anchors along the connector and/or communicate with the gastrointestinal lumen. In one embodiment, one lumen communicates with one expandable element, and another lumen communicates with another expandable element on the elongate structure. In a further embodiment, an additional lumen (not shown) in the elongate structure communicates with the region between the expandable elements so that the quality of a connection between the two body lumens can be interrogated.

An expandable element 92 is further associated with the distal end of the connector 90. As described above, the expandable element, or anchor 92, can expand from an undeployed, to a deployed state, where the diameter of the tube in the deployed state is larger than the diameter of the tube in the undeployed state. Any of the materials, devices, and/or configurations mentioned above can be used in this embodiment. In this embodiment, a hole (e.g. enterotomy) in the body lumen 94 is created by a surgeon during a surgical procedure with or without assistance from the elongate structure; the enterotomy is approximately the size of the undeployed expandable element 92.

A second surgically created enterotomy 98 in a portion of a second body lumen (for example, small intestine) 98 allows for the connector-nasogastric tube to be further placed into the small intestine 98. The diameter of the connector-nasogastric tube 98 defines the ultimate diameter of the anastomosis between the stomach and the small intestine. Typically, in the Roux-en-Y procedure, the diameter of the anastomosis is very difficult to define accurately. The diameter of the connector-nasogastric tube can therefore be chosen to satisfy a pre-specified requirement for the diameter of an anastomosis. The expandable element 92 is then expanded in the small intestine and serves to enable the small intestine to be urged against the stomach 88. As described above, the expandable elements can be produced from any of a number of materials including shape memory materials, balloons, magnets, etc.

A second expandable element 99 (FIGS. 3G-H) is slideable along the nasogastric tube connector. In one embodiment, a separate lumen 100 can communicate and control the second expandable element 99. The separate lumen 100 can be slideable with respect to the first lumen of the nasaogastric tube 90 and is also lockable with respect to the first lumen so that the first and second lumens (and therefore the first and second exapandable elements cannot slide with respect to each other). The individual lumens can be locked at the proximal end of the nasogastric tube-connector by the operator. Alternatively, the separate lumen 100 can be fixed with respect to the first lumen and the second expandable element 99 is itself slideable and lockable along the separate lumen 100; the second expandable element 99 can communicate with the separate lumen 100 for actuation into the expanded state. Once the first and second expandable elements are expanded, the body lumens (e.g. small intestine and the stomach) can be urged toward one another in compression 102 as shown in FIG. 3 g.

After the urging step, the nasogastric connectors or lumens can be fixed with respect to one another so that compression 102 is applied between the two expandable elements and hence between the serosa of the two body lumens. The nasogastric connectors can be fixed temporarily (e.g. during application of an adhesive 106) or more permanently (e.g. 3-7 days after a procedure) with respect to one another depending on the method of creating an anastomosis between the two body lumens.

In one method of creating the anastomosis between body lumens, the expandable elements (92, 99) are comprised of magnets or electromagnets which attract one another. In this embodiment, the nasogastric connectors can be fixed by virtue of the magnets attracting one another, maintaining the nasogastric connectors fixed with respect to one another with the body lumens in between. In another embodiment, the expandable anchors are held fixed with respect to one another by virtue of the lumens of the nasogastric connectors being fixed with respect to one another (described above). The amount of compression created by any of these embodiments can be sensed with a tensiometer via the nasogastric connector or connectors. The compression between the body lumens can be applied for any period of time in order to produce an anastomosis. For example, the compression can be applied for a period of time during an operation when an adhesive 106 or sutures are applied to the apposed body lumens. Alternatively, the compression is applied over a longer period of time to allow for natural healing (natural compression anastomosis) of the anastomosis (e.g. 3-7 days). During a 3-7 day time period, the patient can be fed through a lumen of the nasogastric connector 90. A 3-7 day time period is long enough to allow for healing of an anastomosis or a leak from an anastomosis. With the current embodiment, the degree of compression of the anastomosis can be defined by a tensiometer.

In another embodiment (FIG. 3I), an additional element 104 is applied over the nasogastric connector or near the connector but around the apposition of the body lumens. This additional element 104 is applied to the nasogastric connector during the surgical procedure or is a component of the nasogastric connector when it is placed into the body lumens. The purpose of this additional element 104 is to facilitate connection between the body lumens. In this capacity, element 104 can be adhesive in nature or can be activated to be adhesive in nature. This element can be magnetic, paramagnetic, or ferromagnetic, potentially enhancing the magnetic power between the other two elements, 92, 94. In one example, the adhesive element 104 is compatible with a tissue glue (e.g. cyanoacrylate, fibrin glue, polyethylene glycol based sealants, and glutaraldehyde based sealants) to enhance bonding to the outer portions of the body lumens. In one example, cyanoacrylate, was applied to SIS™ (Surgisis; Cook Corp, Indianapolis, Ind.) after compression was created with a nasogastric connector. The burst pressure of the anastomotic connection was 59 mm of mercury and the anastomosis was created in three minutes.

In other embodiments, element 104 is responsive to activation by an electromagnetic means such as radiofrequency energy or optical energy. In some embodiments, the material of the element is chosen to facilitate adhesion. Examples of such materials include biomimetic materials (see above) or adhesive nanomaterials (for example, US patent application 20040250950 to Dubrow et. al. which describes devices comprising superadhesive nanomaterials which can be used in this embodiment and herein incorporated by reference).

In some embodiments, element 104 is a sensor which, when in place, can detect the strain or stress of a peristaltic wave or a food bolus passing through the anastomosis. In other embodiments, element 104 is an adjustable restriction device, an electrical stimulator, or a component of a closed loop feedback system. In another embodiment, element 104 is an electroactive polymer which can act as a sphincter on command from an electrical signal.

In one embodiment (FIG. 3H), adhesive devices or systems can include systems wherein light 108 is introduced through the nasogastric connector or through a port external to a patient. The light acts directly on element 104, or in the case where element 104 is absent, directly on the tissue in order to bond the two body lumens to one another, or in other cases, when an adhesive 106 is applied directly to the region between the two body lumens. The wavelength range of the light source can be from about 250 nm to about 11 microns depending on which material is activated by the light. For example, tissue adhesives may be activated in the range of about 250 to 600 nm with or without a photosensitizer and constituents of the extracellular matrix, such as collagen, can be activated by the infrared wavelengths 800 nm to about 11 microns.

In some embodiments, the nasogastric connector is applied not to create an anastomosis 111, but to protect an anastomosis 111 (FIG. 3K). For example, the system can be applied to an anastomosis 111 created by staples or by hand. In these cases, compression is created between the anastomosed body lumens 111 by the expandable elements (92, 99) of the nasogastric connector which can then protect the anastomosis while it is healing (e.g. over 1-3 days). The patient can be fed through a lumen 109 of the nasogastric connector 90 while compression is applied to the body lumens. In another embodiment, an additional lumen is provided within the nasogastric connector; this additional lumen allows for a fluid to be placed in the space created between the body lumens. The fluid can be placed under pressure because of the seal between the expandable elements; the fluid and can be a dye or a contrast material in some embodiments. A leak or fault in the connection between the body lumens can then be detected by detecting leak of fluid either visually or with a pressure detector on the proximal or distal ends of the nasogastric connector. If a leak is detected, then the anastomosis is already under compression and is simply left in place for a longer period of time until the leak goes away (i.e. the anastomosis heals). In this embodiment, the nasogastric-connector can serve as a feeding tube, a compression device, a leak detector, and an anastomotic protection device. If there is a fault or leak, the compression system is already in place and the anastomosis will be protected.

Multi-Effector Gastric Restriction Structures and Devices

In some embodiments, the transgastric fastening assemblies, or other restriction devices, serve to reduce the volume of the stomach or restrict the entry of food, and in addition, provide for electrical stimulation and/or sensing; furthermore, the gain, or the relationship between an input parameter (e.g. a food bolus) and an output parameter (e.g. stimulation) of the device, can be assigned prior to implantation of the device and/or can be adjusted after implantation of the device. In these embodiments, an electrical signal runs through electrodes in the transgastric fastening assemblies enroute from a sensor or enroute to alter the contraction patterns of the stomach and/or to electrically create a feeling of satiety through one or more afferent patient nervous pathways (e.g. vagus nerve). Electrical stimulation can enhance or work synergistically with volume reduction and/or the creation of a restriction to flow in the stomach. Thus, the fastener assemblies and restriction devices of the present invention can serve as sensing and/or stimulation structures which are useful, for example, in the creation of exogenous satiety feedback loops (see below). In one embodiment, a sensor is provided on an anchor, connector, extragastric balloon, to detect the degree of buoyancy, or flotation, of the structure within the abdominal cavity.

In one embodiment, an exogenous gastric feedback loop (see FIG. 17 a) is described; a satiety feedback pathway is created surgically by implanting a transgastric fastening assembly 700 wherein the connector 712 is adapted to be a strain gauge (or have a strain gauge as an integral component) and the fastening assembly 700 is further connected via a device efferent pathway 720 to a patient afferent pathway such as the vagus nerve 722. Additional examples of patient afferent pathways include the parasympathetic or sympathetic nervous system which contain patient afferent satiety nerve fibers. In other embodiments, the device afferent pathway (strain gauge sensor) communicates with a device end-effector pathway. For example, if the connector 712 were produced from a shape memory alloy such as nitinol (nickel-titanium), the connector 712 could be induced to decrease in size (generate extra tension) when an electrical current (heat) passes through it. In other embodiments, an electroactive polymer can be used as an actuator and/or a sensor in this system. In some embodiments, the strain gauge is located in proximity to the connector but is not the same device as the connector.

In one example, when the strain gauge is activated (e.g. by food passing through the stomach), a message is transmitted to the connector at which point the connector contracts to thereby prevent the flow of food into the stomach. Alternatively (or in addition to) in another embodiment, activation of the strain gauge transmits a signal to the device efferent pathway 720 which in turn sends a signal to the patient afferent pathway 722.

In addition, a gain controller 710 can be provided on the device in one embodiment in order to adjust the relative action (increase in connector tension or degree of stimulation of the vagus nerve) related to the sensing parameter. This device configuration allows the device to apply tension only when necessary (e.g. when food flows into the stomach). In some embodiments, this device configuration can allow for minimal tension to be applied to the device except when required (e.g. when food flows into the stomach). This configuration can save power, may also lead to a decreased tendency for erosion of the devices, and/or may prevent associated complications with devices such as the Lap-Band™, the complications of which include reflux. In one embodiment, an electroactive polymer serves as a controllable actuator; when a food bolus is sensed by the sensor, the polymer is stimulated to change shape and therefore act as a flow restrictor. When the stimulation (i.e. food bolus) ends, the voltage applied to the electroactive polymer is decreased, thereby allowing food to enter the stomach once again. In this case, there is only gastric restriction during food boluses.

In another embodiment of an exogenous satiety pathway (FIG. 17B), a restricting band type device 815 is placed around a portion of the stomach. As is well-known to those in the art, restricting bands typically contain a balloon contained within a rigid outer shell. An additional inventive feature is to endow the restricting device 815 with the ability to sense circumferential tension or pressure such as, for example, would be created when food flows through the distal esophagus and proximal stomach or when a peristaltic wave approaches the restricting structure. Surgical restricting devices which circumscribe the gastroesophageal junction are well-known in the art (see for example, U.S. Pat. No. 64,653,213); these surgical constricting devices can be further fitted with pressure or volume sensors (e.g. a circumferential strain sensor) 817 in order to create device afferent pathways 817 which respond to the feeding state and simulate (via device efferent pathways 821) patient end-effector pathways 822 (e.g. gastric muscle), device end-effector pathways (e.g. nitinol or electroactive polymer based bands), patient afferent pathways such as the vagus nerve 820, or other elements of the visceral nervous system (e.g. sympathetic plexus). Sensor 817 can also communicate directly with a device end-effector pathway; for example, rather than a balloon, the band can be produced from an electrically responsive material such as nickel-titanium. In this embodiment, the material (and therefore the entire constricting band) can be induced to contract when electricity is run through the material, which generates heat to induce a shape change in the material (in this case to generate an increase in tension). In this embodiment, the tension of the band and therefore its restricting ability are controllable through the shape memory material. In other embodiments, the restricting material is produced from an electroactive polymer which can respond to an electrical field.

In some embodiments, the band also has a balloon which is adjusted by nickel-titanium or by a magnetorheologic fluid (for example), which can also be used to fill the balloon portion of the band. After detecting a feeding state, an electric current passes through the magnetorheologic fluid or through an electromagnet which allow the band to become firmer, more viscous, or less compliant, and thereby more difficult for food to pass through the band. In states when the patient is not taking any food, the fluid inside the balloon is soft and does not apply pressure to the stomach wall.

By detecting the flow of food through the region of the restriction device and inducing restriction electrically in these embodiments, the stress on the stomach can be limited to predominantly the “on” time of the restricting device. This arrangement can limit the tendency for erosion exhibited by implantable devices and can also limit the power requirement for electrical stimulation or to change the diameter of the band. In other embodiments, the device end-effector pathways which adjust the restriction elements run in parallel with the sensor but are composed of separate materials. In some embodiments, these devices are further equipped with gain control in which the relationship between the inputs and outputs can be modified. Such gain controls can further be modified externally with a wireless type transmitter.

Exogenously created satiety pathways can further contain a control system 819 (FIGS. 17B, 21, 22) which can communicate externally through (for example) wireless transmitters 827 for recording and gain adjustment. The control system 819 can incorporate device afferent pathways 815 (integral sensor 817 such as a strain gauge in one embodiment) such that recording of pressure or volume changes in the distal esophagus, pH in the stomach, relative movement of the afferent sensor, strain or stress on the transgastric connector or circumferential bands, or relative movement of the fasteners of the transgastric fastening assembly, can be fed to the control system 819. Furthermore, the control system 819 has controllable or programmable gains such that the response (e.g. the patient afferent 820, device afferent 815, device efferent 825, device end-effector 831, and patient end-effector 833 pathways) to stimulation is increased or decreased. The gain control can occur with a wireless type 827 transmitting device in some embodiments. Importantly, the schematics of the control system in FIGS. 21, 22 are only one depiction of many possible pathways of input and output flow. The various boxes, lines, sensors, and actuators can be mixed and matched in any combination to provide a beneficial effect for a patient. Additional sensors and actuators can be added to the system as well. Some actuators may even be placed outside the abdomen to alert patients or physicians of patient behaviors.

In another embodiment, a sensor (device afferent pathway) 817 is implanted using the methods and devices described herein (e.g. the connector-fastener system and implantation tools described above and below); the sensor 817 can communicate with or be a component of the stimulator and/or the restriction device. In one embodiment, a sensor is placed in the stomach wall (with or without a restricting structure) and senses stretch in the stomach; in another embodiment, the sensor detects transgastric stress and strain or circumferential stress or strain. This sensor can communicate with the stimulator or restricting device to create a feedback loop in which stretch is sensed (the sensor) and then a signal is sent to the stimulator portion of the system (e.g. the device efferent pathway) wherein a nerve (e.g. the patient afferent pathway), for example, the vagus nerve or sympathetic plexus, is stimulated to prompt the patient to slow their intake of food. The end-effecter (patient end-effector pathway) of the feedback loop does not have to be a nervous structure and in some embodiments is a muscular portion of the stomach or duodenum such as the pyloric channel, the antrum, the cardia, or the fundus. In some embodiments, the patient end-effecter pathway is a stimulus such as a small electrical current under the skin to inform the patient that the stomach is full and to stop food intake. In another embodiment, the patient end-effector is an audible alarm. In some embodiments, the device end-effector pathway is an actuator on the gastric band or near to the band and the end-effector can have its power output automatically adjusted. In one embodiment, a transgastric fastening assembly serves to reduce the volume of the stomach as well as provide for electrical stimulation. In this embodiment, an electrical signal runs through electrodes in the transgastric fastener assembly to possibly alter the contraction patterns of the stomach or to electrically create a feeling of satiety in addition to reducing the volume of the stomach and creating a restriction to flow in the stomach. Thus, fastener assemblies of the present invention can serve as electrodes which are useful, for example, for gastric electrical stimulation.

In one embodiment, an exogenous satiety pathway is recreated surgically by implanting a transgastric fastening assembly wherein the connector is adapted to be a strain gauge. In this embodiment, transgastric anchors serve as anchors and/or stimulators and/or sensors in addition to reducing volume or causing mechanical restriction. The fastening assembly is further connected via a device efferent pathway to a patient afferent pathway. Examples of patient afferent pathways include the parasympathetic or sympathetic nervous systems which contain patient afferent fibers which can induce satiety.

In another embodiment, a satiety pathway is recreated surgically by placing a constricting device around a portion of the stomach where the constricting device is able to sense circumferential tension or pressure such as, for example, would be created when food flows through the distal esophagus and proximal stomach. Surgical constricting devices include devices such as the Lap-Band™, transgastric anchor assemblies, or the extragastric restricting devices (e.g. a balloon) discussed below. Any or all of these devices can also be placed around or near an anastomosis such as a Roux-en-Y anastomosis. FIG. 17B, 18, 21, 22 depict a constricting device 815, 1000 within an obesity treatment system. Sensor 1010 detects a stimulus, the signal is interpreted by the device control system 825, and the signal is delivered to a patient efferent, device end-effector (for example, further constriction of a nitinol based or electroactive polymer band or balloon), device efferent, and/or patient end-effector pathway.

FIG. 23 depicts a patient management system 2300 which utilizes patient information logged by an implantable device or non-implantable device. The patient can be an obese patient but doesn't have to be an obese patient. For example, heart failure patients can be managed with this patient management system as well. A signal from a device is received by the receiver 2320, which transmits the information to the patient management software. The receiver can be a wireless receiver or it can be connected to the pressure sensing system via a wire (in either the implantable or external handheld embodiments). After the data enters the patient management software, it can be displayed on a screen or a printout, stored, sent to a physician, or interpreted by an algorithm. In one example shown in FIG. 23, the algorithm is based on the stress from the implantable device reaching a threshold level 2370 in which case the force created by the implanted restriction device is decreased. Alternatively, the stress on the implanted device is too low, in which case, the stress created by the implanted device is increased 2390. The algorithm in some embodiments can make use of data stored in a database 2330. In some embodiments, a fee for usage is built in to the patient management system 2350. For example, a fee can be charged for using the system or for the procedure of measuring the stress on the implanted device. Alternatively, a billing agency 2350 is made aware of the system usage and a fee is charged based upon usage. Insurance companies can also be directly charged for system use.

In FIGS. 18 a-c, a surgically placed banding system 1000 is depicted around the proximal stomach 1005. The band system 1000 comprises a rigid restricting structure 1030 and balloon 1010 which acts to restrict the flow of food into the stomach relative to the pressure in the balloon which initially is dependent on the volume of fluid in the balloon 1010; in this embodiment, the balloon can be fitted with a sensor (e.g. pressure sensor) to provide information about feeding habits including frequency of meals, volume of meals, and consistency (e.g. caloric intake). The pressure sensor 1020 can be incorporated into the fluid fillable balloon 1010 of constricting system 1000. When food passes through the lumen of the restricting device, the pressure increases inside the balloon 1010, signaling patient ingestion. The pressures sensor 1020 can detect changes in balloon pressure as a bolus of food passes through the constricting device system 1000. Although one pressure sensor is used in one preferred embodiment, in other embodiments, one or more pressure sensors (1020 in FIG. 18B), strain, or other sensors can be coupled to one another or directly to the balloon.

In one embodiment (FIG. 18D), one or more pressure sensors 1085 are incorporated into the port 1080 of a laparoscopic band 1091. The port 1080 communicates directly with the balloon. When fluid is introduced into the port by a surgeon, the pressure in the balloon is measured in order to determine and set the volume of the balloon. In this embodiment, pressure sensors communicate directly with the fluid chamber of the port and therefore communicate directly with the pressure in the balloon. Sensing pressure directly in the port can be advantageous because the balloon and or surgery does not have to be modified to add a pressure sensing to the treatment regime of the patient. Furthermore, in patients whom already have a band in place, the port 1080 (because it is extra-abdominal) can be changed without having to worry about the balloon (the intrabdominal portion); therefore, a band which is already in place can be outfitted to sense pressure via a relatively straightforward extra-abdominal band change. Furthermore, the port already in the marketplace can be retrofitted with pressure sensors, a power supply, and a telemetry without having to develop or change the balloon (the Lap-Band™) the patient already has in place. All of these sensing devices can further be adjusted, changed or calibrated when the port is accessed percutaneously.

In one preferred embodiment, a pressure sensor can be incorporated into the bottom portion of the port 1080 by cutting a hole in the port and placing the pressure sensor through the hole so that it is in fluid communication with the fluid inside the port. The sensor can further communicate with a transmitter (e.g. a wireless transmitter) 1090 and power supply. The power supply does not have to be implanted; for example, power can be delivered inductively and remotely to the pressure sensor through the skin. Furthermore, the pressure sensor can communicate with an automated system which fills and/or empties the port based on measurements from the pressure sensor.

FIGS. 18E and 18H depict the Restriction Device Stress Sensing System 1089 (in this embodiment, a pressure sensing system). Adjustment port 1080 communicates with a restriction device (not shown). Underneath the port is the sensing system 1089. Integral to sensing system 1089 is snout 1100 which is a hydraulic coupling tube for communication with the port 1080. The tube can be made of any standard machineable or moldable material such as stainless steel, carbonized steel, cobalt chrome, etc. Pressure sensor 1085 is a low cost sensor such as that from Freescale Semiconductor (MPX2300DT1). The snout 1100 is in communication with the inside of the port as well as the pressure sensor 1085. The snout can be further filled with a fluid to maintain hydraulic continuity with the port 1080. Preferably, the fluid inside the snout is an inert fluid with respect to the piezoelectric membrane within the pressure sensor 1085. In this embodiment, because the inert fluid is not water or distilled water or any other fluid not compatible with a silicon pressure sensor (an example of an inert fluid can be silicone which would be compatible with a pressure sensor such as a silicon microfabricated pressure sensor with a polysilicon membrane), the pressure sensor is protected within the system; the top portion of the snout can be covered with a membrane 1105 which is inert to saline (for example, PTFE). The diaphragm or covering membrane 1105 therefore retains the inert fluid inside the snout yet hydraulically communicates with the fluid in the band; this allows the diaphragm 1105 to transduce the pressure inside the port 1080 to the pressure sensor 1085 over a long period of time (e.g. years) without degrading the pressure sensor.

In some embodiments, pressure sensor 1085 is not a micromachined device but is made from a material which otherwise responds to strain, stress, or pressure change. For example, an electroactive polymer is a device in which a capacitance is created by the polymer in between two electrodes. The capacitance is exquisitely sensitive to changes in pressure on one or both sides of the polymer. This type of polymer sensor system can possibly be manufactured from more naturally biocompatible materials than silicon.

Amplifier 1110 amplifies the signal generated by the piezoelectric polysilicon membrane in the pressure sensor. The amplified signal is then transmitted through the microcontroller system to the data logger which records time and voltage (correlated with pressure) from pressure sensor 1085. The microcontroller 1120 converts the analogue signal from the amplifier to a digital signal for storage in the data logger 1140. The microcontroller is powered on by the power source in response to a signal from the timer 1130. It accepts power at every ½ or 1 second interval depending on the program within the device. The microcontroller can be programmed to power up and sample pressure at even a faster rate though this frequency may not be necessary from the clinical standpoint. The microcontroller is powered on and off so that overall power in the circuit is conserved. For example, with a duty cycle of 10%, the power required for weekly data transmission and sensing at ½ second intervals on a continuous basis allow the device to be powered for a year. In some embodiments, the timer calls for power through the circuit at a lengthy interval (e.g. 5-30 minutes), and if the pressure is above a given threshold, then the circuit senses and logs pressure every fraction of a second. In other embodiments, the pressure is sampled at a constant rate. The sampling rates and other microcontroller variables can be controlled externally through the patient management system 2300. Although components are shown independently in FIG. 18E, those skilled in the art would recognized that any or all of: the data logger, the timer, the RF transmitter, the amplifier, and even the pressure sensor can all be condensed into one circuit.

FIG. 18H depicts a port 1080 fitted with a customized circuit 1089; the circuit is similar to that shown in the schematic in FIG. 18E. The thickness (T) of this custom circuit (without snout 1105) can be less than one mm or 1-3 mm or greater than 3 mm. It can contain an inductive circuit to receive power and/or a capacitive circuit to store power. Alternatively, in some embodiments, the circuit has a power supply (e.g. a small coin type battery) built into it. The circuit within sensing system 1089 can further be adapted to enable programming of the microprocessor via wireless transmission or via percutaneous access through the skin. The radiofrequency transmitter, microcontroller, and pressure sensor are all built into the customized circuit of sensing device 1089. Snout 1105 is an addition to the pressure sensor placed on the circuit after or concomitant with the pressure sensor. As described above, snout 1105 can isolate the pressure sensor from corrosive fluids such as water or saline yet maintain hydraulic continuity with the port 1080 and the implanted restriction device.

In some embodiments (FIG. 18H), port 1080 further comprises a visualizing material 1087 which enables visualization of the port 1080 under ultrasound guidance. Visualization material is one which provides contrast to the ultrasonic waves. Contrast is typically provided at fluid interfaces. Therefore, material 1087 can be a polymer which contains a gas or a mixture of a gas and a liquid (for example, air and water). With enhanced visualization under ultrasound, port 1080 can be accessed in locations which do not necessarily have fluoroscopic (X-ray) capabilities such as a surgeon's office.

In some embodiments (e.g. FIG. 18f), a hydraulic pump 1170 communicates with the adjustment port 1080. The hydraulic pump 1170 in one embodiment can be manufactured with an electroactive polymer as the actuator. The pump communicates with a fluid reservoir 1180. In the instance where the hydraulic pump is an electroactive polymer, the pressure sensor can be a part of the electroactive polymer membrane and in this embodiment, is the sensor and the actuator. The hydraulic pump can function autonomously to pump fluid into the port and then into the implant; alternatively, patient management system 2300 can be used to direct the hydraulic pump to fill the adjustment port 1080 to a given pressure. In one embodiment, the hydraulic pump is utilized to change the buoyancy of the restriction device by injecting or removing air, liquid foam inside the restriction device.

In other embodiments (FIG. 18G), a pressure sensing system 1089 communicates with inflation tube 1087 from the implanted structure (e.g. an adjustable, stomach restricting band) 1091 in a T configuration. In this embodiment, port 1080 communicates with hydraulic line 1082 which splits off into a second hydraulic line 1087 which then communicates with a pressure sensing system 1089. In this embodiment, the pressure sensor is not rigidly coupled but is hydraulically connected in a flexible manner.

Although certain embodiments have described an implantable system, the pressure sensing system can be a handheld system 1089 (FIG. 18I) which communicates with a fluid line 1099 which then communicates with an implantable device 1093. In some embodiments, the handheld pressure sensing system 1089 for the implantable device can communicate hydraulically with the adjustment port 1080 through a fluid line 1093 percutaneously introduced with a needle through the skin. When pressure sensing system 1089 is handheld and external to the patient, wireless data transmission is optional since data transmission could occur with an electrical cable leading to a patient. Pressure sensing system 1089 can contain the snout and isolating system described above or the pressure sensor can be made to be disposable such that it is included in manifold 1094 or is removable from the system 1089 itself. Inflator 1095 is a manually powered device to inflate the implantable restriction device 1093 while pressure is being measured via the pressure sensing system 1089 through the manifold 1094.

In summary, handheld device 1089 is part of a management system which includes the pressure sensors and retrofits described above. It may contain the pressure sensor snout (isolator) and diaphragm described above as well. This handheld system can sense the pressure in the band through the skin of a patient (via percutaneous access via the manifold 1093) when the band is implanted in a patient. The patient can be given a food bolus or a water bolus and asked to swallow, after which a pressure tracing will show up on a reader on the device 1089. The reader can be at the patient's bedside (e.g. as a component of device 1089) or the reader can be separated from the patient (e.g. through a receiver on a PC); in some embodiments, a wireless transmitter is used. Connector 1099 transmits pressure from the manifold 1094 to the sensing system 1089. Fluid line 1093 communicates with the implanted device through a needle introduced percutaneously through the skin of a patient.

In some embodiments (FIG. 18B), sensor 1020 is not a pressure sensor but a temperature sensor, pH sensor, strain gauge, camera etc. The pressure sensor 1020 is incorporated into obesity management system (e.g. see FIG. 20) 1060; in one embodiment, obesity management system 1060 is an electronic control system which incorporates the pressure sensor and the output 1050 (e.g. a stimulator). Output 1050 is any of the patient or device efferent or afferent outputs described above and below; in one embodiment, the output pathway is a stomach muscle stimulator 1070 which also stimulates vagal afferents and/or vagal efferent pathways. Required, but not shown is a source of power which, as is well-known in the art, is required for operation of the system and can be delivered remotely or through an integral power supply.

FIG. 19 depicts a surgically created restriction system 1200 which can be placed near or around an anastomosis (e.g. a Roux-en-Y) 1230. In one embodiment, a band 1205 is utilized as the restriction as well as the structure incorporating a sensor. In another embodiment, surgical clips, sutures, and/or staples 1230 are utilized as sensors for the system 1200. In another embodiment, a port is attached to the constricting band and contains a pressure sensor. In one embodiment, an effector system, such as a vagal nerve stimulator 1240, is incorporated into the surgically created restriction system 1200. As described in other embodiments, there are other system outputs which can be combined with or used in place of the vagal nerve stimulator 1240. Additional components of the other embodiments above and below can be incorporated into the system depicted in FIG. 19. These additional components include telemetry, adjustable gain, power, etc. In addition, although a restricting band 1205 is depicted, other structures such as the transgastric fastening systems or devices similar to the Lap-Band™ can be used in place of the restricting band 1205 in this system 1200 at a surgically created anastomosis 1230.

FIG. 20 depicts a surgically created restriction system placed at the inlet of the stomach. In this embodiment, the restricting portion of the system 1300 is a transgastric assembly as described above. Sensing system 1060 communicates with the transgastric assembly 1300, processing the physical parameter (e.g. stress/strain) associated with the assembly 1300 and delivering an output signal to a device such as an electrical stimulator 1070.

In another embodiment of the current invention, a neurostimulator or neurostimulator lead is a component of the restriction or volume reducing device (but does not have to be an integral component; for example, it can be distal in the stomach yet communicate with the restricting device) and is placed in the serosal layer of the stomach or small intestine to stimulate the muscular or nervous portion of the stomach or small intestine (e.g. the duodenum). In some embodiments, the stimulator contacts and acts on the parasympathetic, the enteric, or the sympathetic nervous system; in other embodiments, the stimulator acts on the muscular portion of the stomach. The stimulator can be placed anywhere along the stomach including the anterior and/or posterior walls of the stomach. In some embodiments, the stimulator contacts the mucosa and in other embodiments, the stimulator does not contact the mucosa. In some embodiments, a sensor is placed as a component of the stimulator or as a separate device. In some embodiments, the stimulator further communicates with a second or third stimulator through a wired or wireless connection.

FIG. 22 further depicts a system for weight control with a surgically created restriction at the center 1100. The system contains one or more output pathways such as gastric wall stimulation 1110 and/or visceral stimulation 1120. The system also can contain adjustable gain controls 1130 which control the relationship between the restriction device 1100 and the inputs and outputs. The gains are adjustable from a location external to the patient, or in some cases, are internally adjustable (e.g. through an endoscope). A telemetry system 827 allows for outside monitoring and/or adjustment of the system.

A further component of the system is the ability of the system to detect 1140, store, and transmit 827 sensory and motor information from the effector pathways 1110 and 1120; that is, pathways 1110 and 1120 can sense currents (e.g. from the stomach, vagus, enteric, or sympathetic nerves) as well as provide therapeutic electrical current. The ability to sense the currents can be used to optimize the therapeutic electrical currents or enable understanding of the patient's behavior. This information includes voltages, amplitudes and waveforms from neural pathways such as the parasympathetic, sympathetic, gastric muscle, and enteric nervous pathways. When interpreted in relation to patient ingestion and type of ingestion, these signals can be used to further understand satiety signals generated in reponse to ingestion. In this manner, the system can essentially learn from itself and be optimized for each patient.

Extragastric Restriction Devices

In another embodiment, an extragastric balloon (FIGS. 11A-11C) is used to reduce the volume of the stomach and/or create a barrier to the flow of food and a restrictor to the flow of food. Although balloon is used in the description below, any device which expands from a contracted state to a deployed state can be used. FIG. 11 a depicts the balloon (or other expandable device) 430 in the undeployed configuration. The balloon is placed through a trocar port 306 after the trocar port has been placed between the peritoneum and the anterior wall of the stomach (with or without general pneumoperitoneum) as described in detail above and below. FIG. 11B shows an embodiment of an extragastric balloon 430 in its deployed state. The balloon 430 is attached to the abdominal wall by any of the percutaneous anchor-connector assemblies and methods described above. Stem 432 is the residual from the connector used to place the balloon with an optional access port/valve for further inflation and/or deflation after the balloon is placed; for example, a surgeon can access the subcutaneous port using a needle placed through the skin. The access port can further be retrofitted with a pressure sensor to detect the pressure exerted by the balloon 430 on the stomach wall 302. A pressure sensor or other force transducer (e.g. a strain transducer) can also be placed in or around the balloon 430 itself. Anchor 434 is similar to the anterior anchors described above and can be placed between the muscular portion of the abdominal wall 304 and the subcutaneous fat or between the anterior layer of muscular fascia and the muscle (e.g. the rectus muscle). In some embodiments, the balloon is placed close to the pylorus or at the fundus of the stomach close to the GE junction and can optionally be contoured 430 to partially or completely surround the GE junction or the pyloric outlet. In some embodiments (FIG. 11 c), the posterior portion of the balloon is fixed 436 to the outer or inner portion of the stomach using any of the fastening systems described above (two or more point fixation); for example, the balloon can be delivered over a connector, a guidewire, or a rail to its position inside the abdomen. The balloon can be delivered within a port The balloon can further be combined with a transgastric anchor assembly to aid its attachment, to (adjustably) control tension on the transgastric assembly, or to synergize with the transgastric anchor assembly. The posterior portion of the balloon can be fixed to the anterior gastric wall with an anchor delivered through the stomach with an endoscope. The balloon structure can be used in combination with a VBG, a Ruox-en-Y, or any other surgical procedure.

In one embodiment, an anchor is used to fix the extragastric balloon to the stomach using an endoscope in combination with a guidewire (guidewires are thin flexible wires which are well known in the cardiology and gastroenterology fields) which is also placed through the endoscope. In some embodiments, guidewires are used through laparoscopic trocars or directly through incisions in the skin of the abdominal wall; in some embodiments, guidewires are similar to the connectors discussed above. In some embodiments, the balloon is attached to fixation points other than the abdominal wall 304 and stomach wall 302. For example, the balloon can be attached to the diaphragm, the liver, the colon, or the omentum. In some embodiments, an expandable device other than a balloon is used. For example, the expandable device can be an expandable cage which expands based on pre-stressed metal or polymer which then returns to its pre-determined shape.

The extragastric balloon can be placed anywhere along the stomach, even at a position 1-5 cm below the gastroesophageal junction at the same place where laparoscopically placed adjustable gastric bands are currently placed. The balloon can further be shaped to partially circumscribe, or form a lumen (fully circumscribe) around, a structure such as the gastroesophageal junction. The balloon can have roughened regions to improve friction and/or adhesion with the stomach. The balloon can further have support structures (either separate materials or components of the same material with different mechanical properties) 438 which are rigid or more rigid than the balloon and in some embodiments help to apply force toward the stomach.

Even though the balloon may completely circumscribe the stomach, it does not necessarily have to be a continuous ring and can be discontinuous even though it forms a complete ring when fully expanded. For example, FIG. 11D depicts an expanding device 430 (e.g. a balloon) which does not form a complete lumen around the region of the stomach. The device 430 can circumscribe up to approximately one-quarter of the circumference of the stomach, or from one-quarter to one-half the circumference of the stomach, or even one-half to three-quarters the circumference of the stomach. Support structure 438 can circumscribe a similar circumference or can circumscribe its own circumference of the stomach.

In one embodiment, device 430 is not an expanding device but is made from a material which tends to contract passively or actively. For example, device 430 can be made from a material such nitinol which starts at a first width and tends to move toward a smaller width unless a force is applied to prevent contraction of the width. If the device in this embodiment were designed for a region of the stomach 1-5 cm below the GE junction 302, the device may begin at a width of from 5-10 cm, then contracting to a width of between 0.5 cm and 4 cm. In another embodiment, it is supporting material 438 which is produced from a material that tends to contract passively or actively. Supporting material 438 in this embodiment can be produced from a material such as nitinol which creates rigidity along one portion of the expandable device 430 or itself is adjustable; for example, structure 438 can be a fluid fillable balloon as well, essentially creating a multi-compartment fluid fillable structure. Support material 438 can also be placed inside of the expanding device, an expanding device inside an expanding device, or an inflateable device inside an inflateable device. The inner expandable device can provide support for the outer supporting device or the inner device can be used to increase or decrease the overall density or buoyancy of the device.

Alternative materials for this embodiment include a variety of electroactive polymers and materials. Any of the sensors, actuators, and systems described above and below can be incorporated into this embodiment as well.

In one embodiment, a material configured as a mesh (FIG. 11E) 440 can be placed within 1-5 cm from around the GE junction of the stomach; alternatively, the device 440 can be placed along the length of the stomach (FIG. 11H) or at the region of the pyloric valve. The mesh can be made from materials such as nitinol, an electroactive polymer (see for example U.S. Pat. No. 6,940,211 herein incorporated by reference in its entirety), and/or other materials which possess shape memory and/or can be actively shape-controlled to apply pressure to the stomach and create a restriction to the flow of food through the stomach. Mesh 440 can be made from any of the biocompatible materials above and/or below and additionally can be produced from a composite material (FIG. 11F).

The material, which can be referred to as an anchoring frame, anchoring structure, anchoring material, anchoring tab, or anchoring body can be placed at any part of an implantation procedure. For example, the material can be placed prior to implantation of the anchor, inserting the frame initially and then attaching the anchor afterward using a suture or a connector. The anchoring frame can also be placed into the abdomen and attached to the abdominal wall, a restriction device subsequently attached to the frame.

FIG. 11F depicts a cross-section of the mesh 440 shown in FIG. 11E (C-C′) at the level of the stomach 302 below the GE junction. Mesh 440 is shown partially surrounding the stomach 302. Mesh 440 can further be coupled to a support structure 443, the support structure in some embodiments constructed to apply force which tends to constrict stomach 302. In some embodiments, the support structure is a constricting band placed around the stomach and the mesh aids in attachment of the constricting structure to the stomach 302. For example, the constricting structure can be any of the transgastric or extragastric structures described above and/or below. In one such embodiment, the constricting structure is removable and the mesh is permanent; therefore attachment of the constricting structure relies on attachment of the constricting structure to a healed or healing mesh rather than the constricting structure being attached with surgical suturing.

FIG. 11G depicts an expandable structure (e.g. a balloon) 430 placed between the stomach wall and another structure, such as the abdominal wall, the liver, the diaphragm, and the omentum. The expandable structure 430 can have a textured surface 439 and/or an anchor 436 which aids in the positioning/attachment process of the expandable device; in this capacity, it serves as a guiding structure or device. The textured surface can include mechanical interlocks which assist attachment of the expandable structure to the anchor; for example, the textured surface can have a surface which conforms with a region of the expandable structure so that they mate to one another to create a mechanical interface. In this embodiment, the anchor does not have to penetrate the mucosal layer of the stomach. In some embodiments, the connector (guidewire and/or catheter) 432 is inserted directly through the abdominal wall or through a port such as a laparoscopic port. In some embodiments, connector 432 remains in place and becomes the communication line for the expandable device 430. In some embodiments, multiple guiding devices 432 are used in the abdomen. For example, a first guiding device can be used to place an expanding device 430 and a second guiding device can be used for retraction of organs (e.g. the liver) or for visualization of the procedures. In other embodiments, connector 432 further serves to transmit electrical current to at least a part of the expanding structure (e.g. balloon) to stimulate the stomach or associated nervous structure(s).

FIG. 11H depicts another embodiment in which the expandable device (e.g. a balloon) substantially traverses the stomach in the horizontal and/or longitudinal direction to substantially cover the external surface of the stomach. A typical human stomach may have a longitudinal length of 20-50 centimeters and a width varying from 1-30 centimeters depending on where in the stomach the width is measured. An optional fluid communication line is provided to fill the balloon with a fluid or otherwise provide electrical or mechanical power. In another embodiment, balloon 430 (or any of the extragastric balloons mentioned above) are fillable using an endoscope which can penetrate the gastric wall and fill or deflate the balloons.

The extragastric balloons and/or other devices can further be configured to act as stimulators which can deliver electrical current or can sense certain parameters such as peristaltic contraction, food boluses, or other patient activity. Electroactive polymers and shape memory alloys can also be used as sensors and/or actuators. In one example, an electroactive polymer consists of multiple polymer layers wherein one or more of the layers comprises a sensor such as a strain gauge or pressure gauge. This information can be used to increase or decrease the volume of the balloon accordingly.

As described above, any of the extragastric balloon embodiments can further contain an integral sensor to detect changes in volume (for example, volume and/or pressure changes) of the restricted portion of the stomach. Such changes in volume can then be used to create satiety feedback loops to deter the patient from further food intake (as discussed above and below, for example, vagal nerve stimulation).

In some embodiments, mechanical fixation structures are used to attach the balloon to the serosa of the stomach. Other means of attaching balloons to the stomach include adhesives, pledgets, expandable anchors, etc. The connector-anchor systems above are used to attach the balloon to the abdominal wall. The connector can further serve as an inflation valve for the extragastric balloon.

In another embodiment (FIG. 11I), a flexible guiding device (e.g. a connector) 432 is depicted as part of a system to operate or place devices 430 in or around the stomach. Device 432 is placed through lumen 437 of device 430. Device 430 can be expandable in some embodiments. In one embodiment, anchor 436 is first implanted in the stomach after a trocar and/or camera is/are optionally placed in between the abdominal wall and the stomach. The anchor 436 could be a temporary anchor or could be a grasper which temporarily grabs onto the stomach while devices are implanted over the guiding devices 432 (connectors). Anchor or grasper 436 can first grasp structures other than the stomach including the diaphragm, the liver, the omentum, a nervous structure, or the crus of the diaphragm.

A device such as a camera 452 can optionally be placed close to the anchoring device 436. This camera can be flexible and of a CCD or CMOS type. The camera is slideable along the guiding device and can be used to direct placement of the device 430 or used to direct the injection of materials or to visualize the application of energy to the stomach wall or related nervous structure. The guiding device 432 allows for positioning and fixturing inside the abdominal cavity. The guiding device can purely serve to guide devices to the stomach or it can ultimately serve to conduct electrical or mechanical power to the expanding device 430 or other surgical devices such as electrocautery devices, retractors (e.g. liver retractor), graspers, or scissors.

Extragastric constriction systems can be particularly advantageous in patients who have had bariatric procedures in the past (e.g. Roux-en-Y, Vertical Banded Gastroplasty, or a duodenal switch). Patients who have had these procedures have anatomy posterior to their stomachs which is typically scarred and difficult to access. Therefore a device which applied pressure from the top or sides would be advantageous in this patient population as access would be achieved through percutaneous means and possibly percutaneous surgery and would not involve encircling the stomach. The assumption is that compression from on top of the stomach is counteracted by the relative stability of the retroperitoneum behind the stomach. This assumption is proven in the animal experimentation described below.

In some embodiments, extragastric expanding devices are combined with transgastric anchors (FIGS. 15H-I). In these embodiments transgastric restriction devices have an extragastric balloon 772 to adjust stoma (passageway for food through the device) 770 size. Balloons 772 can be placed on either side of the stomach. Balloons can be sensors or stimulators as can band 750 or 752.

FIG. 24 illustrates a device and associated implantation method to implant the device. The inset FIG. (24′) depicts a perspective view of a sheath placed under the liver which was placed through a percutaneous conduit 2520. Sheath 2510 can follow over a suture or over a wire such as a guidewire introduced into the abdomen through percutaneous conduit 2520, sheath 2510 carrying a device such as an extragastric restriction device, a neurostimulator, a muscle stimulator, and even a circumferential restriction device, etc. In some embodiments, the sheath 2510 follows both a suture and a guidewire and in some embodiments, sheath 2510 follows only a guidewire or only a suture. In the embodiment where a suture is placed into the abdomen and sheath 2510 passed over the suture, the suture can be attached to an abdominal structure prior to the sheath being delivered over it. Such suturing techniques are readily available in other parts of the field of abdominal surgery such as for the placements of hernia meshes. Pre-knotted sutures can be placed into the abdomen of the patient and sheath or devices then slid over the pre-knotted sutures. With reference to FIG. 24, a device 2600 is shown being delivered from within sheath 2510 over a wire and/or suture 2570. The device 2600 is being placed between the stomach 2550 and the liver 2670. Tube 2580 can ultimately be utilized for access to the device 2600 post-operatively. Access can include inflation or deflation of the device 2600, charging of a battery of device 2600, downloading of data from device 2600, altering of a programming state of the device 2600, recharging the device, etc.

FIG. 25 further details a method of implanting device 2600. Once the device is shuttled over guide sutures (connectors) 2570, it is positioned over the area of interest, in this example, the crus of the diaphgragm. In the embodiment where the device is attached to the diaphragmatic crus, the device is placed on the crus and knots tied using sutures 2570 (connectors). Port 2510 is then connected to fill tube 2575 by sliding it over the tube and then removing the excess tubing 2575. Once the sheath 2510 has been removed from the abdomen, then the device 2600 can be anchored in placed using knots in the suture. Device can be folded in such a way so as to minimize its diameter and so that it can fit into an access sheath to provide for minimal access surgical techniques. In FIG. 25′ the device 2600 is shown as it unfolds from an accordion like folding pattern. In an alternative embodiment, crimping elements (described above) are used which are placed over the guide sutures and crimped onto the sutures to hold the device on the structure within the abdomen.

FIG. 26 a-b further depicts structural features of device 2600. FIG. 26 a depicts a cutaway of the device 2600 which resides between the stomach 2550 and liver 2670. Subcutaneous port 2800 is attached to device 2600. When inflated, device 2600 exerts a force F on the stomach 2550 which limits expansion and creates compression in some regions of the stomach. For example, device 2600 and associated force F can compress the stomach 2550 to create a tube like structure shown above (e.g. see reference to the Magenstrasse and Mill procedure). In FIG. 26b, device 2600 shows an attachment tab 2720, or a through lumen for a connector, a guidewire, a suture, etc. Region 2700 can be a coating or an attached material overlying the belly of the inflateable device 2600. In some embodiments, region 2700 is an attached mesh or other attached material which in some cases is itself inflateable and can be made from a material which is heavier or lighter than the expandable balloon to enable different regions of relative buoyancy to be created on the device. Region 2700 in some embodiments is a mesh, a hydrophilic coating, a hydrophobic coating, or separate material for attachment to other structures of the device 2600. Attachment member 2730 communicates with device 2600 and is responsible for its inflation and deflation as well as creation of shape changes.

FIG. 27 depicts the device in its implanted configuration. In one embodiment, the device 2600 is tucked away underneath the liver in its implanted position. In this example, device 2600 was implanted using sutures attached to the crus 2720 of the diaphragm. Additional tacking sutures 2760 were placed on the anterior wall of the stomach. These attachments float on the stomach and are likely necessary only in the beginning of the procedure until a capsule forms around the implantable device and sutures, keeping it in place. Material 2710 can be a material which aids in capsule formation or can be an attachment rail. Port 2800 was attached to the connector which communicated with the expandable device 2600. As described above, one or more anchors or sutures can be used to fix the device to the abdominal wall and in some embodiments, only abdominal wall sutures are used for the extragastric balloon.

Experimental Verification of Extragastric, Non-Circumferential Stomach Restriction

To provide experimental verification of the assumption that the one-sided balloon can provide for functional stomach restriction, a prototype of this assembly was placed in a porcine abdomen and fixed in its operative position according to the method described above and depicted in FIG. 27. The device 2600 was attached to the crus of the diaphragm and attached to the anterior wall of the stomach using floating serosal knots which did not pierce the wall of the stomach in accordance with FIG. 27. A gastrograffin swallow was performed one month later. With filling of 0-50 cc, the balloon exerted minimal force on the esophagus during the bolus of fluid. After the balloon was filled with up to 100 cc or more of saline, it was evident that the extragastric balloon indeed created a physiologic level of stomach restriction. FIG. 29 depicts some of these results in the form of a schematic of a picture obtained from a fluoroscopy performed during the procedure. The animal was given a gastrograffin radiocontrast meal and fluoroscopy performed. As can be seen, at the 100 cc level of contrast swallowed 3020, the balloon 3000 constricted the stomach 3010 enough to practically prevent all flow into the stomach from the esophagus 3040. The extragastric balloon was also filled with contrast material to evaluate its position relative to the esophagus 3040 and stomach 3010. Thus, it is evident that one-sided restriction, or non-circumferential restriction, or an extragastric balloon indeed can indeed utilize the retroperitoneal region behind the stomach to create enough pressure on food entering the stomach to create a back pressure within the esophagus and therefore induce satiety.

In accordance with these experimental data, a method is described whereby an extragastric balloon pushes on the stomach, pushing the posterior portion of the stomach against the retroperitoneum, thereby compressing the stomach walls together to create a resistance to food entering the stomach, to create a sensation of fullness.

The procedure performed to evaluate the extragastric inflateable implant in the animal experiment is also useful in the clinic when treating human patients. For example, in one method of treating a patient, the extragastric balloon is implanted in proximity to the stomach and filled with fluid. In one embodiment, it is preferable to fill the balloon with radiocontrast saline so that it is visible under fluoroscopy and during follow up of the patient. In one embodiment, the balloon is filled with a small amount of fluid so that it can heel into place, forming a capsule around it and assisting in its anchoring to the stomach wall. After 15-30 days, the balloon can then be inflated to the proper volume and level of stomach restriction. The balloon can be filled with a water soluble contrast agent such as gastrograffin so that the balloon will be visible at follow up clinic visits.

At explantation of the balloon in the experimental validation described above, the assembly was found to be adhered in place with a thin capsule around it. At explantation, the volume within the assembly was adjustable so that a large resistance was created at the entry to the stomach, creating a barrier to food entry into the stomach. Indeed, at high enough levels (for example 100 cc), an enlarged esophagus was found to have been created, a so called “mega-esophagus,” indicating that a single-sided balloon can indeed create a back pressure within the stomach using the immobile retroperitoneum to provide the resistive force behind the stomach.

In the clinical environment, an extragstric assembly can therefore be used to prevent or limit the amount of food ingested by a patient. The device can be filled with barium or gastrografin during implantation and the effect on the esophagus can be used to determine the amount of volume utilized within the balloon to create satiety by viewing its effect on the esophagus. Alternatively, a nasogastric manometer can be utilized to detect the back pressure on the esophagus and indicate the need for tightening or loosening of the restriction device prior to setting its final configuration prior to the end of surgery.

FIG. 28 depicts results from an implantable pressure sensor (described in detail above) which was implanted in combination with a Lap-Band™ from Inamed-Allergan but is generally applicable to any of the restriction devices provided herein. The gain of the pressure sensor device was adjusted after implantation so that the signal (ingestion) would be separated from the noise (movement, peristalsis, etc.). After several days of continuous data collection at 1 Hz, the entire dataset was downloaded wirelessly from the device through the animal, revealing that the signal 2810 to noise 2820 ratio was indeed highly favorable to detecting ingestion 2810 of food in the animal versus noise 2820 inherent in the system and relative to normal movement of the animal. This is an important result and can be utilized in many different ways. For example, the signal 2810 is essentially a snapshot of the back pressure on the food bolus as the bolus passes through the restriction. If the restriction device is not functioning, it loosens, or it slips, then the back pressure signal is decreased or non-existent. The slippage then shows up as a decreased signal or no signal during ingestion and is therefore detectable by the pressure sensor and can be transmitted outside of the patient to an operator such as a physician who can alert the patient. On the opposite end of the spectrum, if the restriction device is too tight or actually closes off the stomach passage, then the pressure signal will be sharper and larger in scale, again providing a signal to adjust the restriction device or that the device is too tight. The footprint of the signal can also be used as a baseline for a patient in that the quality of the signal can be benchmarked relative to weight loss or weight gain and the signal footprint therefore used as a relative indicator versus future changes.

The ingestion signals can also be used to couple to a therapeutic or behavioral change in a patient. For example, the ingestion signal can be used to trigger a stimulator such as a muscle stimulator, a nervous stimulator, a cutaneous stimulator, etc. as described above. Alternatively, the ingestion signal can be used as an external auditory signal to remind a patient of a diet.

In accordance with the data obtained related to the pressure sensing apparatus, a pressure sensor can be implanted into a patient at the time of implantation of a restriction device. After implantation and healing of the device in place, the gain of the device can be adjusted so that a signal:noise ratio is obtained wherein the pressure sensor detects physiologically relevant signals related to food ingestion. The physiologically relevant signals can then be utilized by a physician to adjust the restriction device in order to optimize therapy with the restriction device.

Surgical Instruments

Surgical instruments which can be used to implant many of the devices of this invention are disclosed. The surgical instruments represent one example of the methods to implant the disclosed devices but not the only possible means for implantation. Any of the devices and/or methods and/or features of the current inventions can be implanted with an endoscopic procedure in addition to endoscopic means to assist a percutaneous procedure or an endoscopic means to assist a laparoscopic procedure.

FIG. 4A illustrates one embodiment of a tissue grasping instrument 200. The tissue grasper has a tubular outer sleeve 210 to which a portion of a handle 212 is attached at the proximal end. As shown in more detail in the blow-up, FIG. 4A′, disposed within the outer sleeve 210 is a tubular inner member 214 which has an outer diameter such that it can slide within the outer sleeve 210 in the longitudinal axis of the outer sleeve 210 but cannot move substantially transverse to the longitudinal axis of the outer sleeve 210. At the proximal end of the inner member, a second portion of a handle 216 is attached. At the distal end of the inner member is a pair of jaws 220 which is connected to the inner member at a hinge point 222. When the distal end of the inner member 214 is displaced from the inside of the outer sleeve 210 such that the hinge point 222 is outside the outer sleeve, the jaws 220 assume their open position as depicted in FIG. 4A. As the hinge point 222 is withdrawn into the outer sleeve 210, the outer sleeve forces the jaws 220 into their closed position, as illustrated in FIG. 4B. The opening and closing of the jaws 220 can be accomplished by manipulation of the handle portions 212 and 216.

The distal end of the grasping instrument 200 is configured to cut, puncture, or dilate tissue when the jaws 220 are in the closed position. In one embodiment shown in FIG. 4B, the jaws 220 have screw-thread-shaped protrusions 224 on the surface. By rotating the instrument as it passes through tissue, the protrusions 224 facilitate the penetration of tissue, similar to a corkscrew. In another embodiment illustrated in FIG. 4C, the instrument has jaws 226 that form a sharp tip 228 when closed. In yet another embodiment, the jaws form a blade which can cut through tissues when in the closed position. One of skill in the art would recognize that the above configurations can be combined, or that other configurations are possible which facilitate the passage of the tip of the instrument through the wall of the stomach or other tissue.

It also should be realized to one skilled in the art that the closed end of the grasping device does not have to be the only instrument responsible for cutting through the tissue; the central lumen 230 of the device can be utilized to assist in tissue penetration. For example, a needle (e.g. a Veres needle) 232 can be passed through the lumen and the needle 232 can make the initial puncture through the tissue. The configuration of the distal end of the grasper is meant to be a tissue dilator and facilitator of the entry into the stomach (or any other hollow organ) after the needle makes the initial puncture. For safety, the needle can be retracted as the tissue grasper dilates the tissue.

In the embodiment of the tissue grasper 200 illustrated in FIG. 4A, the inner member 214 and outer sleeve 210 have a central tunnel 230 that extends the length of the tissue grasper. The tunnel 230 allows for the passage of an expanding means such as a needle 232, or other instrument or device such as the posterior or anterior anchor described above (see for example, the description above regarding the connector-suture combination in which the suture is left behind and the outer sheath of the connector is pulled away), through the length of the tissue grasper as shown in FIG. 4A. The central tunnel is also adapted such that a radially dilating sheath can be inserted through it. The diameter of the central lumen is preferably at least 4 mm, but can be at least 5, 6, 7, 8, 9, 10, 11, or 12 mm. In an alternative embodiment, the distal jaws can be configured to close through an electromechanical means, a purely magnetic means, or via an electroactive polymer such that the inner member is not necessary.

FIG. 5A illustrates one embodiment of an anchor implantation instrument 250 to implant the anterior anchor. The implantation instrument has a tubular outer sheath 252 which has a handle 254 attached. At the distal end, the outer sheath flairs out to an increased diameter 255 to accommodate the anterior anchor in its substantially folded position as illustrated in FIG. 5C. Within the outer sheath is an anchor grasping instrument 256 similar to the tissue grasping instrument of FIG. 4A, made up of a tubular middle sleeve 260 and a tubular inner member 264. The tubular middle sleeve 260 has an outer diameter such that it can slide within the outer sheath 252 in the longitudinal axis of the outer sheath 252 but cannot move substantially transverse to the longitudinal axis of the outer sheath 252.

The tubular middle sleeve 260 of the anchor grasping instrument has a portion of a handle 262 attached at the proximal end 261 of the instrument. Disposed within the middle sleeve 260 is a tubular inner member 264 which has an outer diameter such that it can slide within the middle sleeve 260 in the direction of the longitudinal axis of the middle sleeve 260 but cannot move substantially in transverse to the longitudinal axis of the middle sleeve 260. At the proximal end of the inner member, a second portion of a handle 266 is attached.

The distal tip 263 of the instrument is illustrated in more detail in FIGS. 5B and 5C, with the inclusion of the anterior anchor 40 of FIG. 2A and connector 12 of FIG. 1A. FIG. 5C is a side section view taken along the line C-C of FIG. 5B. At the distal end 263 of the inner member 264 is a pair of hooking members 270 which are connected to the inner member at a hinge point 272. When the distal end of the inner member 264 is displaced from the inside of the middle sleeve 260 such that the hinge point 272 is outside the middle sleeve, the hooking members 270 assume their open position as depicted in FIG. 5B. As the hinge point 272 is withdrawn into the middle sleeve 260, the middle sleeve forces the hooking members 270 into a closed position, as illustrated in FIG. 5C. The opening and closing of the hooking members 270 can be accomplished by manipulation of the handle portions 262 and 266.

The instrument is designed such that the anterior anchor is easily manipulated. When the anterior anchor is in its substantially folded or compressed configuration as in FIG. 5C, the entire anterior anchor assembly can be manipulated along the longitudinal axis of the connector 12. FIG. 5C depicts the assembly as it would be introduced over the connector 12 and into the patient. The operator pulls the connector 12 toward the operator such that the posterior anchor is urged toward the anterior anchor. When in position, the operator deploys anterior anchor 40. To deploy anterior anchor 40, outer sheath 252 is pulled back toward the operator. Middle sleeve 260 is then withdrawn proximally toward the operator as well. Hooking members 270 tend to fan out as the middle sleeve is pulled back and will release hooks 52. Once deployed, anterior anchor 40 is now fixed in a longitudinal position along the connector 12.

An important feature of the anterior anchor in some embodiments is that it be grippable by a laparoscopic grasping instrument and able to be translated through a laparoscopic port; further, the anterior anchor is reversibly translatable along the connector such that the surgeon can place and replace depending on what is seen by the endoscopist or the tension indicated by the tensiometers. If the surgeon wants to re-adjust the anterior anchor, connector 12 is manipulated so that the hooks 52 of the anterior anchor are brought into contact with hooking members 270; middle sleeve 260 is advanced distally from the operator, permitting hooking members 270 to engage the hooks 52; such contact is facilitated by pulling back (proximally) on the connector 12. By manipulating the middle sleeve 260 over the hooking members 270, the hooks 274 on the ends of the hooking members 270 can engage the hooks 52 on the anterior anchor 40. The outer sheath 252 is then slid over the anterior anchor 40 (or the anchor-middle sleeve complex is withdrawn into the outer sheath 252), until it is compressed into an undeployed configuration as shown in FIG. 5C. As described above, when the anterior anchor 40 is in a substantially compressed configuration, it can move along the length of the connector 12 in either direction.

In an embodiment where an inflatable anterior anchor such as the one illustrated in FIGS. 2G-2I is utilized (or in the case that the anterior anchor is otherwise sufficiently compliant to be pushed through a laparoscopic port), a standard laparoscopic grasping instrument (with teeth) can be used to manipulate the anterior anchor. When the inflatable anterior anchor is in the uninflated position, it is sufficiently compliant such that it can easily be passed through a laparoscopic port prior to inflation and deployment or after it has been deflated for readjustment; the middle sheath may not be necessary because the compliance of the balloon enables easy compression into the outer sheath. The inflation tube 63 passes through the laparoscopic port and out of the patient. This allows the inflation tube 63 of the anchor to be temporarily opened or closed outside the patient allowing for deflation and reinflation until the anchor is in place. The inflation tube is then sealed and cut off, preferably substantially flush to the surface of the anterior anchor. Clearly, one skilled in the art will understand that this instrument can be used for extra-gastric balloons or balloons attached to the abdominal wall or inside the abdominal wall.

Methods of Implantation Percutaneous Procedure

FIG. 6A depicts the initial step of a preferred embodiment of a surgical method to implant a transgastric fastening assembly. The first part of one procedure embodiment, the “percutaneous procedure,” involves entering the stomach with an endoscope 300 and insufflating the stomach with a gas. When insufflated, the anterior wall of the stomach 302 is pushed toward the anterior abdominal wall 304 to create a potential space (the stomach interior). After insufflation of the stomach, an incision is made in the skin and a typical laparoscopic port 306 is placed through the anterior abdominal wall 304 to a position wherein the distal end is in the potential space between the abdominal wall 304 and the anterior wall of stomach 302. The laparoscopic port 306 can be a radially dilating type port or similar port known in the art. Even though a laparoscopic port is used, in these steps, generalized pneumoperitoneum is not required and this part of the procedure can be done with minimal or no general anesthesia as discussed in the next paragraph.

A particularly advantageous laparoscopic port is one which allows visualization (with a laparoscope) of the individual abdominal layers as the laparoscope is being pushed through the abdominal wall (well known to those skilled in the art). Use of such a port allows the surgeon to “see” the different layers of the abdominal wall from within the trocar (using a standard laparoscopic camera) as the trocar is advanced through the abdominal wall. The endoscopic light inside the stomach will be “seen” by the surgeon as the port approaches the inner layers of the abdominal wall because the endoscopic light source transilluminates through the layers of the stomach wall and inner layers of the abdominal wall. Such visualization is advantageous if the patient has a very thick abdominal wall (e.g. in a morbidly obese patient) because the surgeon needs to ensure that another organ (e.g. the colon) is not positioned between the stomach and the posterior wall of the abdomen. Once the transillumination of the stomach is visible through the transparent port, the port 306 can be slipped in the abdomen between the abdominal wall and the anterior wall of the stomach. This portion of the procedure may be done without pneumoperitoneum and without general anesthesia (e.g. local anesthesia).

At this point, the camera can also be used to visualize the anterior wall of the stomach and/or it can be used to visualize placement of devices into the anterior wall of the stomach; examples of some devices include stimulators, sutures, clips, drug delivery devices, sensors, and volume displacing devices (extragastric balloons are discussed below). As described above, visualization of the surface of the stomach and implantation of devices into the anterior wall (without puncturing through the stomach) can be achieved with this method and does not require general pneumoperitoneum. The camera can be slid along the stomach to reach virtually any portion of the anterior stomach, duodenal wall, or lower esophagus. Additional ports can also be placed in the space between the abdominal wall and the anterior wall of the stomach. With the additional ports, additional instruments can be used which can facilitate placement of the devices into the walls of the stomach. Suture passers, knot tiers, electrosurgical devices, and clip appliers are just some examples of instruments which already exist in the surgical arts and which can be utilized to facilitate placement of devices into the walls of the stomach. Small incisions can be made in the serosa of the stomach and a pocket can be made so that stimulators can be placed in a pouch in the stomach wall. Therefore, using the inventive technique of entering the abdomen without general anesthesia and without pneumoperitoneum as detailed above, many different gastric operations can be performed.

In FIG. 6F, a method for percutaneous gastric surgery is illustrated (also see FIG. 11I for the associated devices). Percutaneous gastric surgery begins with at least one skin incision 370 after which a surgical device such as a connector (rigid or flexible) is pushed through the skin and abdominal wall to enter the space between the stomach and the abdominal wall 372. Abdominal structure(s) 374 is/are contacted with one or more flexible or rigid connector device(s). Temporary graspers and/or anchors 376 can also be used to contact structures within the abdomen such as the stomach, liver, omentum, and the diaphragm; some of these temporary devices can be used to retract the liver (for example) by sliding a retractor over the flexible connector to (for example) push the liver away from the stomach while surgery is being performed on the stomach. Once the abdominal structure is contacted or grasped with the flexible or rigid connector device(s), a surgical device 380 can optionally slide over the flexible connector(s) to perform surgery on the stomach; examples of surgical devices include electrosurgical hooks, organ retractors, graspers, and knot tiers. Spaces or grooves can be made with these devices on either side of stomach or GE junction. Once these spaces and/or grooves are made on either side of the stomach, other devices 380 can be slid over the connector to perform procedures, visualize a region, or implant devices in the stomach. Examples of devices 382 and procedures include stimulators, balloons, ablation of nervous tissue, fundoplications, and injection of bulking agents to treat reflux disease (for example). In some embodiments, the temporary grasper serves as an anchor and the connector becomes the outside communication path for a device such as an extragastric balloon (see below).

At this point in the procedure (or any other point), a therapeutic energy device can also be applied to the stomach. For example, a laser (or other phototherapy device), a radiofrequency device, a microwave device, or an ultrasound device can be applied to the stomach. Furthermore, electrical and/or nervous mapping can be performed with the surgical device in a position between the anterior wall of the stomach and the abdominal wall. In the embodiment where an extragastric balloon is being deployed (see above and below), such deployment can proceed at this step. The ability to perform these procedures without general pneumoperitoneum and with minimal anesthesia is enabled by the inventive methods described herein and is considered advantageous. Furthermore, in the embodiment where balloons are placed inside the stomach or neuro- or muscular stimulators or other devices are placed in the walls of the stomach, these devices are implanted at this step and do not require pneumoperitoneum or general anesthesia.

At this point in the percutaneous procedure (after entry into the stomach), the tissue grasping instruments 200 of FIG. 4A is inserted through the port 306 with the jaws 220 in the closed position (with or without a needle projecting in front of the instrument) and is passed through the anterior wall of the stomach 302. When the jaws of the instrument are closed, the jaws define a sharp, dilating, and/or cutting configuration which can more easily advance through the stomach wall.

FIG. 6B depicts the next step in the percutaneous procedure. The jaws of instrument 200 are used to grasp the posterior wall of the stomach. Although one method to approach the region behind the stomach is shown in the FIG. 6b, there are many ways in which the posterior wall of the stomach can be accessed. For example, suction can be used, as can visualization with an ultrasound probe, CT scan, MRI, and/or fluoroscopy. The posterior wall of the stomach 314 is lifted away from the retroperitoneum 316, allowing for access to the potential space of the lesser peritoneal sac 320. A needle 232, such as a Veres needle (well-known in the art, a Veres needle allows for easy and safe access into and between two serosal layers), is inserted through the central channel 230 of the instrument and passed through the posterior wall of the stomach 314 into the potential space of the lesser peritoneal sac 320. The potential space of the lesser peritoneal sac 320 is expanded by injection of a gas, such as carbon dioxide, through the needle 232. In other embodiments, the potential space is expanded using a liquid, gel, or foam. Alternatively, the space can be expanded using a balloon or other space expanding or space filling device; alternatively, a surgical instrument (e.g. electrocautery and/or blunt ended grasper, etc.) can be used in place of a needle to access the lesser peritoneum or to expand the potential space of the retroperitoneum 320. Preferably, the expanded space of the lesser peritoneal sac can extend from the angle of His at the gastroesophageal junction to the pylorus.

FIG. 6C depicts the next step in the “percutaneous procedure” embodiment. With a direct path from outside the patient to the lesser peritoneal sac 322, the needle 232 is withdrawn from the instrument 200. An optional dilation step can be performed at this stage in the procedure using a device such as a radially dilating sheath (e.g. InnerDyne STEP™ system; Sunnyvale, Calif.) inserted through the central channel 230 of the instrument. The dilating device expands the opening in the posterior wall of the stomach in such a way that the opening contracts down to a lesser profile after dilation. A posterior anchor 324 and connector 326, such as those depicted in FIGS. 1B, 1E or preferably 1F, in its reduced profile configuration, is passed through the central channel 230 of the instrument, through the posterior wall of the stomach 314, and deployed in the lesser peritoneal sac 322 as shown in FIG. 6C. Where the optional dilation step is performed, the posterior anchor 324 is passed through the dilating sheath. The connector 326 is preferably of sufficient length to pass from inside the lesser peritoneal sac 322 through the central channel 230 of the instrument and out of the patient's body. FIG. 6D depicts the deployed posterior anchor 324 and connector 326 after the grasping instrument is withdrawn from the patient and tension is applied to connector 326 to pull the posterior anchor 324 against the posterior wall of the stomach 314.

In an alternative embodiment, the space of the lesser peritoneal sac is not expanded before the posterior anchor is placed. For example, in an embodiment where an inflatable posterior anchor is used, the potential space can be expanded by the anchor itself as it is inflated to its deployed configuration.

In another embodiment, the posterior anchor is directly implanted in the retroperitoneum rather than in the lesser peritoneal sac. In this embodiment, the posterior anchor is placed in the retroperitoneum above the envelope of the lesser peritoneal sac. Above the envelope, the retroperitoneum is safe, being above the pancreas and splenic vessels. As is known to those skilled in the art of bariatric surgery, the Lap-Band® is implanted at this spot in the retroperitoneum (however, implantation requires general anesthesia and pneumoperitoneum). A Cat-Scan, MRI, fluoroscopy, or ultrasound can be used to assist in this step.

Laparoscopic Procedure

In the “laparoscopic procedure,” after insufflation (pneumoperitoneum and general anesthesia) of the abdominal cavity with a Veres needle, a retrogastric tunnel 500 is created as is well known in the surgical arts and is shown in FIGS. 15 a-i. The posterior anchors 510 are shown as a component of the retrogastric instrument 512 in FIGS. 12 and 15 a. Embodiments of the posterior anchors 308 are also shown in FIGS. 6E and 1K. Depicted are single posterior anchors with one or more connectors and continuous posterior anchors with one or more connectors. The suture-connector system 309, 311 depicted in FIG. 1H-J is also depicted in FIG. 6E and can be used in one of the laparoscopic embodiments. Connector 309 (in FIG. 6E) engages anchor 308 and locks suture 311 into posterior anchor 308. Connector 309 is then slid over suture 311 prior to the anterior anchor (similar to the anterior anchor in FIG. 13 a; 550) being slid over (tracking) the connector 311. FIG. 15B depicts the configuration of the transgastric anchor assemblies 700 after the anterior anchors are placed, tensioned, and the connectors are cut. FIG. 15C depicts devices of the laparoscopic procedure where the posterior anchor 750 is continuous. Anterior anchors 755 are shown (FIG. 15D) as individual anchors and as discs; however, in some embodiments, the anterior anchors can be rectangular or continuous.

FIGS. 12 a-c depicts some of the steps in one embodiment of a “laparoscopic procedure”; a laparoscopic instrument 500 is provided which has a reversibly attached anchor 510. Grips 520 reversibly grip anchor 510. Any of a variety of gripping mechanisms can be employed to retain the anchor 510 on laparoscopic tool 500. Connector 332 is substantially similar to any of the connectors described above except that in this embodiment, the posterior anchor 510 is not attached to connector 332 when it is inserted through the anterior abdominal wall. The surgeon places laparoscopic tool 500 behind the stomach 428 of the patient and connector 332 is advanced through the lumen of laparoscopic port 545 formed in patient's skin 535 and anterior abdominal wall 530. Connector 332 is then further advanced through first and second walls 540 and 547 of stomach 428. In FIG. 12B, a suture 333 is an inner component of the connector 332 for the transgastric device; an outer portion of connector 332 is removable over the suture after the suture 333 is attached to the posterior anchor 510; connector 332 is then removed from the patient (FIG. 12C).

In some embodiments, a suture is provided on the posterior anchor 510 (not shown) prior to insertion of the connector 332; connector 332 is adapted to pull the suture through the stomach and thence through the abdominal wall after being inserted through the anterior and posterior wall of the stomach. This results in a configuration similar to FIG. 12C. Subsequent attachment of the anterior fastener/s and subsequent urging step where the anterior and posterior walls are brought together is similar as outlined above.

When the connector 332 reaches the posterior anchor 510, gripping elements 520 are released by the surgeon through a mechanism which is integrated into the laparoscopic tool 500. Connector 332 is fixed to posterior anchor 510 through a locking mechanism. Mechanisms of locking connector 332 to posterior anchor 510 are well-known to those skilled in the art of mechanical fixturing. Some or all of the fixturing mechanisms may reside on the connector or on the anchor. In another embodiment, the gripping force of the grippers 520 can be overcome by force applied by the surgeon on connector 332. Reversible locking means other than mechanical means also exist and include magnetic, electromagnetic, and adhesive means.

An anterior anchor 550 (FIG. 13 a) is then placed over the connector 332 by the methodology and devices described in the next paragraph; the mechanism of deploying the anterior anchor is the same in both the “laparoscopic” and “percutaneous” procedures. The walls of the stomach are urged together (FIG. 14 a) to create a resistance to the flow of food within the stomach or to reduce the volume of the stomach. Stomach region 570 depicts one side of the stomach after the walls of the stomach are urged together. Region 570 is the side of the stomach where the food enters. Its (the stomach) volume and capacity are now reduced as compared to its original volume and capacity. Although not shown, connector 332 is subsequently truncated at the level of the anterior anchor 550 after the anterior anchor is deployed by any of the mechanisms described and depicted above. FIG. 14B depicts the transgastric assembly after the anterior anchor 550 is deployed. FIG. 14C depicts a cutting tool which is threaded over the connector and allow cutting of the connector after deployment of the anterior anchor.

FIG. 7A illustrates the step of implanting the anterior anchor in one embodiment. The connector 326 is inserted through the hole or other passageway of an anterior anchor 40 of FIG. 5C, and the anchor implantation instrument 250 of FIGS. 5A, 5B and 5C is used to slide the anchor 40 through the laparoscopic port 306 into the abdomen of the patient. The anterior 302 and posterior 314 walls of the stomach are urged together, either by using the anchor implantation instrument 250 to urge the anterior wall 302 toward the posterior wall 314, or by pulling on the connector 326 and posterior anchor 324 to urge the posterior wall 302 of the stomach toward the anterior wall 314, or by a combination of the two methods. Once the anterior anchor 40 is in the desired position, the anterior anchor 40 is placed in its deployed configuration by manipulating the anchor implantation instrument 250 as described above.

In a preferred embodiment, the inflatable anterior anchor of FIGS. 2G-2I is used, and the use of the implantation instrument of FIG. 5A is optional. After the anterior anchor is in the desired position, the anterior anchor is inflated with a filling substance through the inflation tube until it is in its deployed configuration. The gripping elements 67 and teeth 68 are thus engaged against the connector 326, (12 in FIG. 2I). The anchor implantation device 250 (FIG. 5A) can then be withdrawn from the patient's abdomen.

In another embodiment (FIG. 15 e-g), both the posterior anchor 750 and the anterior anchor 752 are continuous along both the anterior and posterior portions of the stomach. In this embodiment, connectors 765 are suture like or are more rigid as described above. Strain gauges or flexible electrodes may be incorporated into any or all of the connectors 765. Region 770 is the where food flows through the restriction system. In some embodiments, it is desirable to transect 758 a part of the stomach with staplers well known in the surgical arts, creating a region 756 between the staple lines.

In some embodiments (FIG. 15H-I), a fluid expandable component 772 is included in the laparoscopically placed anchors 750, 752. the fluid expandable component 772 combines the best of the banding procedures and the surgical procedures such as the VBG.

With the transgastric fastening assembly complete, the surgeon can examine the resulting configuration of the stomach using an endoscope. If one or more anterior anchors is/are not in the desired location, its placement along the connector can be adjusted as described above. Alternatively, in another embodiment, the anterior anchor can be urged closer to the posterior anchor simply by pushing it along the connector without using the implantation device to capture the anchor and deform it into its reduced profile configuration.

In another embodiment, the anterior anchor can be deflated, allowing the anterior anchor to be repositioned (the anterior anchor is reversibly fixed to the connector), and then reinflated to engage the connector. FIG. 7B illustrates the transgastric fastening assembly with the anterior anchor 40 in its deployed configuration on the connector 326 and the anchor implantation instrument removed from the patient's abdomen. The anterior 302 and posterior walls 314 of the stomach have been urged closer together by the transgastric fastening assembly. Whether the walls of the stomach are urged into contact or not is determined by the surgeon. Contact between the mucosal surfaces can be loose such that food can go through yet a significant resistance to food is provided; alternatively, mucosal surfaces are urged together and touch; however, food cannot pass through the apposed surfaces.

FIG. 7C depicts a transgastric fastening assembly in its final configuration after deployment. Once the surgeon is satisfied that the transgastric fastening assembly is properly placed, a cutting implement, well-known to those of skill in the art, is inserted through the laparoscopic port and the connector 326 is cut, preferably flush to the anterior anchor 40. In some embodiments, the cutting instrument is placed over the connector with the connector as a guide. In an embodiment, where inflatable anchors are used, the hollow connector and inflation tube are sealed prior to, or as a result of, cutting, preventing anchor deflation. Alternatively, if a filling substance which hardens with time is used, it may not be necessary to seal the connector or inflation tube prior to cutting if the filling substance is sufficiently hard or viscous such that it will not leak from the connector or inflation tube.

When more than one transgastric fastening assembly is to be implanted, it is sometimes preferred to insert all of the posterior anchors and connectors before attaching any or all anterior anchors. For example, in FIG. 8A, posterior anchors 330 are show in a position posterior to the stomach with connectors 332 outside the abdomen. Anterior anchors can now be placed over the connectors 332 and the tension independently adjusted under endoscopic visualization. In some embodiments, an instrument to measure and quantify tension is used to measure the compression of the stomach mucosa prior to the operation. In some embodiments (FIG. 8B), test blocks 336 are placed on the laparoscopic ports 334. The tension on connectors 332 can now be tested without placing an anterior fastener on the connector. This type of parallel fastener placement and quantification allows the operator to control the tension of each individual fastener across a row of fasteners. Test blocks 336 are adapted to engage connectors 332 and the optimal tension on the connectors 332 can be quantified using a standard tensiometer attached to connectors 332. The degree of volume reduction can also be tested with this setup and by visualization with endoscope 344. Once the optimal tension has been determined, the anterior fastener is placed over the connector at the pre-determined tension. Tensioning of individual fasteners is in contrast to attempting place transgastric fastening assemblies in series. While possible to individually place transgastric assemblies in series, if one were to do so, each successive assembly would be more difficult to place because the volume of the stomach would be progressively reduced, resulting in more difficult visualization each time.

FIG. 8A depicts an embodiment in which two posterior anchors 330 and connectors 332 are deployed in the expanded lesser peritoneal sac. In this embodiment, there is one laparoscopic port 334 for each connector 332. In an alternative embodiment, there may be more anchors placed than incisions and laparoscopic ports. Depending on how far apart the anchors are placed, a given laparoscopic port can be used to implant a plurality of transgastric implants. This can be accomplished because there is significant mobility of the stomach and/or abdominal wall which allows for different points along the anterior wall of the stomach to be accessed without having to create another hole through the abdominal wall.

In an alternative embodiment, the stomach is fastened to the abdominal wall rather than there being a free space between the anterior gastric wall and the peritoneum of the abdominal wall (not shown). The initial steps are as discussed above. After the posterior anchors are placed, their position can be tested as depicted in FIG. 8B to simulate the configuration after the anterior anchor is placed. Next, the outer laparoscopic port is pulled back so that the anchor deploying instrument directly contacts and sits within the tissues of the muscular abdominal wall. Once the outer laparoscopic port is pulled back, the anterior anchor can be deployed within the abdominal wall musculature and the connector can be cut flush with the anterior anchor. In an embodiment where the inflatable anterior anchor is used, after the anterior anchor is deployed within the abdominal wall musculature, the inflation tube is cut, preferably flush with the anterior anchor.

Method of Reversal

The connector 326 (e.g. a suture) of a preferred embodiment of the deployed transgastric fastening assembly, as illustrated in FIG. 7C, can be cut at a point between the anterior and posterior anchors, which results in reversal of the gastric volume reduction. The connector is preferably made to resist corrosion from stomach acid, but is able to be cut by a cutting implement advanced through an endoscope into the stomach. In the Smith paper (Smith, L. et. al. Results and Complications of Gastric Partitioning. The American Journal of Surgery. Vol. 146; December 1983), a nylon suture was used to traverse the stomach in the anterior-posterior direction and attach the pledgets to the walls of the stomach. The nylon material was suitable for use for over 3 years without any indication of corrosion. Other materials suitable to prevent corrosion and yet allow cutting include plastics such as polyurethane, silicone elastomer, polypropylene, PTFE, PVDF, or polyester, metals and metal alloys such as stainless steel, nickel-titanium, titanium, cobalt-chromium, etc. Once the connector is cut, the walls of the stomach are free to move away from one another, thereby reversing the procedure. Reversal of the procedure can occur at any time (days to years) after the procedure. In a preferred embodiment, the anchors remain in the gastric wall permanently even after the connector is cut or otherwise divided; the anchors are made from a material which facilitates permanent integration into the gastric wall (or other intestinal wall); suitable materials include polypropylene, Alloderm™, Surgisis™, and polyesters. Alternatively in other embodiments, the anchors can, in part or in whole, be manufactured from a bioabsorbable material such that the anchors will eventually be absorbed by the body. In the case of bioabsorbable anchors, it is preferable to have a connector which is at least in part bioabsorbable. In another embodiment, substantially all of the elements of the transgastric fastening assembly are made of bioabsorbable materials, with the intent that over the desired period of time, the entire assembly will be absorbed by the body, reversing the procedure without any additional actions required by a doctor. In another embodiment, the anchors are made of a non-reactive material such as silicone. In this embodiment, reversal of the procedure requires a “laparoscopic procedure;” that is, pneumoperitoneum so that the connectors can be cut and the fasteners removed. The connector is cut with the endoscope and then the anchors are removed with standard laparoscopic instrumentation; being composed of silicone, the anchors in this case will be easily removed.

Even if there is some degree of fusion between the mucosa around the connector at the region of the assembly, once the connector is cut or absorbed, the walls will tend to move apart over time. Alternatively, a balloon or other dissection device is introduced through an endoscope and used to urge apart the walls of the stomach at the point of fusion.

Additional Embodiments of the Disclosed Devices, Instruments, and Methods

The devices, methods and instruments disclosed above and below can be used to treat other diseases, such as gastroesophageal reflux disease (GERD). In this embodiment, a transgastric fastening assembly is placed in the cardia region. Such a configuration would maintain the position of the GE junction in the abdomen and potentially create a barrier to reflux contents. Similar to the devices above, feedback systems can be instituted so that the reflux prevention is initiated as a response to a stimulus such as pH or peristalsis rather than applying continuous pressure to the tissue even when reflux is not present. Furthermore, GERD devices can be equipped with patient controlled features such that when the patient feels symptoms, the antireflux features are activated. Reflux disease can also be treated with sutures or plications placed with a percutaneous procedure and in the region of the GE junction. Placement of the sutures (with or without pledgets) with a percutaneous procedure would not require general anesthesia and would be advantageous in many patients.

In many of the embodiments discussed above, a transverse row of fasteners is depicted which is one method of creating volume reduction or flow restriction. FIG. 9 depicts and alternative embodiment in which three transgastric fastening assemblies 400 are deployed longitudinally in the stomach; such a configuration of anchors results in a tubular configuration of the remaining portion of the stomach. The dashed lines represent boundaries of the divisions of the stomach: the cardia of the stomach 402, the fundus of the stomach 409, the body of the stomach 406, the antrum of the stomach 408, and the pyloric sphincter 410. In one embodiment, the fastening assemblies are not implanted in the antrum 408 (but are implanted longitudinally in the stomach as shown in FIG. 9) in order to maintain the normal digestion process of the stomach. Normal digestion therefore occurs in the antrum which precedes passage of food into the duodenum. In stopping short of the antrum 408, the implants replicate the degree of volume reduction of the Magenstrasse and Mill (M&M) procedure (discussed above in the background).

Food ingested by the patient follows a physiologic pathway for digestion depicted by the arrow in FIG. 9. It travels through the esophagus 412 and enters the cardia of the stomach 402. The food is digested in the stomach and pushed toward the duodenum 414 as chyme for further digestion. The preserved antrum 408 allows for relatively physiologic digestion and emptying into the duodenum 414 akin to the M&M procedure. With transgastric fastening assemblies 400 in place, food which leaves the esophagus 412 and enters the stomach, results in increased wall tension on the lesser curvature of the stomach 416 as the greater curvature of the stomach 418 will be restricted from the food pathway. The path of least resistance will be the path toward the pylorus 410 and duodenum 414. The increased wall tension of the stomach will result in a feeling of satiety by the patient, leading to decreased food intake and weight loss. As discussed further above, any of the transgastric assemblies in this embodiment can have feedback systems which communicate with patient end-effector, patient afferent pathways, device efferent, and/or device afferent pathways. Although three assemblies are shown in FIG. 9, there may be as few as one or as many as ten or more depending on the degree of volume reduction desired. Such flexibility in number of devices as well as the ability of the surgeon to tune the tension between the anterior and posterior anchors is advantageous. Such flexibility may enable, for example, reversal of a few anchors rather than all the anchors, such that the volume reduction procedure is partially reversed. As described above, any or all of the anchors, or parts of the anchors, can be biodegradable and therefore, the gastric reduction procedure would be reversible by virtue of the implanted biodegradable anchors. Furthermore, in some embodiments where there are multiple transgastric connectors which are produced from an electrically active material, different ones of the multiple connectors can be adjusted. In some embodiments, an electrical current is applied to the structures in order to reverse the procedure. For example, some metals and polymers will dissolve (corrode) in response to current.

In another embodiment, a transgastric fastening assembly is placed in the antrum 408 or the region just proximal to the pyloric sphincter 410 if deemed necessary by the gastroenterologist and/or surgeon. Such a configuration would not reduce the volume of the stomach but would cause a feeling of fullness similar to a gastric outlet obstruction, leading to decreased food intake and weight loss. The anchors in this region can also conduct a current to electrically stimulate the pyloric region to simulate satiety.

In another embodiment, a transgastric fastening assembly may be required at the region of the cardia 402 to treat morbid obesity in a similar manner to that utilized with the LAP-BAND™ (Inamed Corp., Santa Barbara, Calif.). In this embodiment, the transgastric fastening assembly is not utilized to reduce the volume of the stomach, but to create a restriction to the inflow of food. In this embodiment, the fastening system can traverse the cardia but does not necessarily completely oppose the mucosal surfaces of the anterior and posterior walls of the stomach. In some embodiments, the transgastric assemblies do in fact completely appose the walls of the stomach together but allow food to pass through by not completely traversing the cardia, leaving a space for flow of food stuffs. The assembly can further be configured to provide electrical signals to the anterior and/or posterior portions of the stomach in this region. The active region of this embodiment can be quite large, in some cases ranging up to 10-15 cm, large enough to traverse almost the entire width of the cardia.

In another embodiment, the disclosed methods in combination with the transgastric fastening assemblies can be adapted to attach a gastrointestinal organ to the abdominal wall which, in addition to reducing volume, can also create a kink in the organ (e.g. the stomach). The kink may cause a resistance barrier (in addition to volume reduction) to gastrointestinal contents and can be useful to treat reflux disease or morbid obesity. Such a kink would also fix the gastrointestinal region to the abdominal wall as well as maintain the reduction of a hiatal hernia in the abdominal compartment (e.g. in reflux disease). A major component of reflux disease is a hiatal hernia in which the gastroesophageal junction freely slides from the abdomen to the mediastinum. A percutaneously placed suture or anchor in the region of the gastric cardia and/or fundus can tether the junction to the abdominal wall and confine the junction to the abdomen.

In other embodiments, the devices and methods of this invention can assist in the implantation of devices such as stents, meshes, stitches, or tubes in the gastrointestinal tract. A major technical difficulty encountered in placing stents, tubes, balloons, stimulators, and meshes inside the lumen of the gastrointestinal tract is that they tend to migrate because the walls of such devices do not adhere to slippery mucosa. A transgastric or transintestinal anchor, implanted with the current instrumentation, could solve this problem. Such a method would be particularly useful in the attachment of the stent part of the stent-sleeve system outlined in patent application US20050075622A1, or the mesh of patent application US20040172141A1. In another example, devices such as those disclosed in U.S. Pat. No. 6,773,441 attempt to place an endoscopic stitch to tether the cardia of the stomach to the fundus to treat reflux disease. Such stitches are tenuous in the long term because they do not necessarily penetrate the serosa. Even if the stitches penetrate the serosa, they tend to erode through the wall with time because of their thin profile and an inability of the endoscopic operator to control tension on the suture when it is placed. With the methods and devices of this invention, such an endoscopic suture can be buttressed with a percutaneously placed anchor.

Although the described methods are focused on the implantation of transgastric fastening assemblies to reduce the volume of the stomach or to increase the resistance to the flow of food in the stomach, the methods and devices can easily be expanded to the implantation of other types of devices such as neurostimulators, gastric muscle stimulators, gastric balloons, and bulking devices inside the wall of a gastrointestinal organ using the percutaneous procedures and devices described herein.

The methods disclosed herein (e.g. the percutaneous procedure) can further be used to apply an energy source to an internal organ without having to give general anesthesia or pneumoperitoneum. For example, the methods and devices of the current invention can be used to apply radiofrequency probes, microwave probes, ultrasound probes, and radioactive probes (to the serosa) in similar ways as disclosed in U.S. Pat. No. 6,872,206. The energy sources can be temporary or permanent and can be activated remotely through the abdominal wall in the case where they are implantable. The methods can further be used for diagnostic purposes prior to performing a surgical therapy. In one example, the methods and devices are used to identify specific nerves or nerve plexuses prior to delivering a specific therapy. In another example, specific hormone producing regions, such as ghrelin, are identified prior to delivering a specific therapy. Following the methods and devices outlined both above and below, instruments can be placed in the abdominal cavity under percutaneous guidance. Any of the layers of the stomach can be accessed and stimulation, ablation, or diagnostic devices can subsequently be placed without anesthesia and without pneumoperitoneum. For example, a stimulation device can be placed in any layer of the stomach wall such as the serosa or muscular layers for example.

Similarly, the anchor assemblies and anchors are applied to solid organs such as the spleen, kidney, liver, and pancreas to urge the edges of a defect together to promote healing; in other embodiments, the anchor assemblies are applied to the blood vessels such as arteries or veins; for example, the aorta or vena cava.

In still further embodiments, fascial defects can be closed with the anchoring assembly described above. FIGS. 7 d-7 e for example shows an anchor being delivered into a fascial defect caused by a laparoscopic port. Using similar methodology to that described above, except applied to a fascial defect, a posterior anchor 362, a connector 360 and an anterior anchor 366 are shown in FIG. 7D. A laparoscopic port 364 is shown as well. After anterior anchor 366 is threaded over connector 360, the connector is 360 is trimmed as described above (shown in FIG. 7E). When the anchoring assembly is in place as shown in FIG. 7E, the defect created by port 364 is effectively closed and the connector stabilized in the anterior abdominal wall. Typically, laparoscopic fascial defects are closed with sutures which can be very difficult in an obese patient. The anchor-connector-anchor assembly shown in FIGS. 7D-E is a possible solution to having to close fascial defects with sutures in obese patients.

In some embodiments, the methods and devices described herein are used to place devices inside or outside the stomach; inside or outside the lesser sac of the peritoneum; inside or beside a structure within the retroperitoneum; inside, beside, or outside the duodenum, pylorus, or gastroesophageal junction. Implanted devices include but are not limited to the anchor devices and transgastric fastening assemblies described above; stents, meshes, stent-grafts, stitches, stimulators, and bulk forming agents can be implanted individually, in combination, and as a component of the same device.

In some embodiments, a transgastric method of placing such stimulators is described which in some embodiments enable placement of stimulators in the lesser peritoneal space where they can stimulate the sympathetic system or directly stimulate structures in the lesser peritoneal sac (such as the pancreas). In these and other embodiments, the transgastric access method to the lesser peritoneal sac is used to place stimulators and stimulate and/or inhibit pain fibers in and around the celiac ganglion. This type of procedure is used to treat patients with severe pain from a tumor or from pancreatitis.

Devices that circumscribe the gastroesophageal junction are well-known in the art (see for example, U.S. Pat. No. 64,653,213); the surgical constricting balloons can be retrofitted with sensors in order to create device afferent pathways which detect overeating and simulate (via device efferent pathways) patient afferent pathways such as the vagus nerve or the visceral nervous system.

The methods and devices of this invention can also be used to place sutures in the stomach or pylorus to treat reflux disease or obesity. Such suturing would be facilitated by the placement of multiple ports through the walls of the stomach. Any of these methods and devices could be used in combination with or in place of the transgastric fastening assemblies to induce weight loss in a patient.

In another embodiment, the novel methods, implantation devices, and anchors of this invention are used to implant devices in one wall of a gastrointestinal organ without volume reduction. One example of such an embodiment is illustrated in FIGS. 10A and 10B in which a balloon-like device is deployed in the stomach to displace volume rather than to reduce volume from the outside. The internal balloon 430 is similar to the posterior anchors in some of the embodiments described above. In one embodiment, after initial insufflation of the stomach and placement of a laparoscopic port 306 percutaneously and without pneumoperitoneum (as described above) between the abdominal wall 304 and the anterior wall of the stomach 302, an instrument is used to penetrate only the anterior wall of the stomach 302 and place an inflatable intragastric balloon 430. Inflation is achieved through the connector lumen 432 and the balloon is placed within the interior of the stomach 428, as illustrated in FIG. 10A. When inflated, the balloon 430 is preferably spherical in shape such that it occupies a substantial portion of the stomach volume when inflated. In the embodiment shown, the connector also acts as the inflation tube for inflating the intragastric balloon. In another embodiment, in addition to the connector, there is a separate inflation tube similar to embodiments presented above. As discussed above, a valve can be located between the anchor and the connector, or alternatively outside the patient. Preferably, after the intragastric balloon is inflated and an anterior anchor 434 is deployed on the connector 432, as described previously. The connector 432 is also cut, preferably flush with the anterior anchor, and the laparoscopic port is removed, as shown in FIG. 10B. The anchor portion of the intragastric balloon 434 is then fixed in the wall of the stomach. In the preferred embodiment where an inflatable anterior anchor 434 is used, the inflation tube is also cut, preferably flush with the anterior anchor. Other devices which may only be implanted in one gastric wall with similar methods and with similar anchoring devices include neurostimulators, muscular stimulators, sensors, and pharmaceutical delivery devices.

FIG. 16 embodies another use for the current invention. The sleeve device 620 is disclosed in US patent application publication US2004/02206882. A major difficulty with this sleeve device is that it is not easily fixtured for stability inside the stomach. Fastening system 610 is used to assist in fixation of the device 620 to the stomach wall; fastening system 610 is any of the devices discussed above and is implanted by any of the methods discussed above.

In another embodiment, a surgical anastomosis is surrounded with the organ spanning anchors and anchor assemblies of the current invention. In this embodiment, the anchors can buttress the anastomosis to protect the integrity of the anastomosis. The buttresses can support both hand-sewn and stapler anastomotic techniques. To prevent or the anchors are placed around or through the anastomosis. In a similar embodiment, a transgastric anchor system (or constricting band) can be used at a gastrojejunostomy in a Roux-n-Y bypass procedure. Both the transgastric anchor system and constricting band can further have associated electrically activateable elements by which flow through the anastomosis can be controlled.

The anchors (and bands), as described above, can also be used to control the flow of material through an anastomosis. Flow control is attainable when an anchoring assembly is applied across an anastomosis and are linked by means of a connector through the anastomosis. The distance between the anchors determines the amount of flow through the anastomosis and therefore, the flow rate can be adjusted quite readily with the device of the current invention. The flow rate is adjustable at anytime during or after the operation. Luminal devices to control the flow rate through an anastomosis can be found in US patent application number 20050022827. The devices of the current invention can be used to accomplish the goal of controlling flow through an anastomosis by placing anchors on either side of the anastomosis with a connector that traverses the anastomosis. Furthermore, the anastomotic flow control device can further have automated control using the materials, methods, and control systems described above in order to automatically adjust flow control or tension on the anastomosis.

In another embodiment, the anchor assemblies are applied to the lung to treat chronic obstructive pulmonary disease (COPD) via functional lung reduction. Rather than removing a portion of the lung (the surgical procedure), the anchors of the current invention are placed through the diseased portion of the lung to close off or at least create a large resistance in one portion of the lung and broncheoalveolar tree so that inspired air does not reach a malfunctioning portion of the lung.

In other embodiments of the current invention, the fastening systems and tools to implant the fastening systems are used to secure closure or repair of blood vessels. The blood vessels can be named vessels such as the aorta, vena cava, pulmonary veins, pulmonary arteries, renal vein, renal artery, inferior mesenteric vein and/or artery, splenic vein and/or artery, portal vein and/or hepatic artery, or the saphenous and/or deep veins. Alternatively, the vessels are unnamed such as in the case of the mesentery of the colon or small bowel. Vessel closure with the current system is possibly more efficient than current laparoscopic means of vessel closure which involve staple or clip occlusion of the vessels; staples and clips do not penetrate the vessel and therefore are often inadequate, or at least do not replicate what a surgeon would do in an open procedure which is place a suture through the vessel to “suture ligate” it as is well-known in the art.

It is also possible that a part of, or any or all of the devices and methods described above are performed with an alternative imaging means; for example, fluoroscope, MRI, ultrasound, and CAT scan.

Although the present invention has been described in the context of certain preferred or illustrative embodiments, it should be understood that the scope of the exclusive right granted by this patent is not limited to those embodiments, but instead is the full lawful scope of the appended claims.

Furthermore, any of the devices, methods, surgical instruments, and features can be used singly or together in order to treat any of the disorders or diseases mentioned above. 

1. A method for treating obesity in a subject comprising: implanting, with respect to a gastrointestinal tract, a restriction device with a sensor configured to detect and store data signals indicative of ingestion and comprising a gain control to control the output of the sensor relative to the pressure changes; adjusting the sensitivity of said sensor so that an input signal of the ingestion is detectable over a signal in the non-ingestion state.
 2. The method of claim 1 further comprising: wirelessly downloading the stored data, relative to the gain control, to a module outside the subject, and adjusting said gain based on said downloaded data.
 3. The method of claim 1, further comprising sending a signal to the subject.
 4. The method of claim 3 wherein the signal communicates with the restriction device or attached component therein.
 5. The method of claim 1 wherein said device is a circumferential restriction device.
 6. The method of claim 1 wherein said device is a non-circumferential restriction device.
 7. The method of claim 1 wherein said device is a trans-gastric restriction device.
 8. The method of claim 1 further comprising: programming the sensor to detect signals indicative of ingestion and when an ingestion signal is detected at a rate of greater than 1 per second, increasing the frequency of detection of the ingestion signals.
 9. The method of claim 3 wherein said signal to the subject is a signal to an implanted gastric stimulator.
 10. A system for detecting ingestion signals in a gastrointestinal tract comprising: a device configured to create restriction in a gastrointestinal organ; a pressure sensor adapted to be implanted in hydraulic continuity with the restriction device and adapted to receive signals and trasmit signals; a gain adjust within the pressure sensor circuit to adjust the gain within the circuit; a power supply adapted to be implanted with the pressure sensor.
 11. The system of claim 10 wherein said device is a circumferential restriction device.
 12. The system of claim 10 wherein said device is a non-circumferential restriction device.
 13. The system of claim 10 further comprising: a memory circuit, adapted to sample and record pressure at a rate of at least 1 Hz.
 14. The system of claim 10 further comprising: an algorithm wherein said pressure sensor samples pressure less than a defined frequency and when a signal above a threshold is detected, samples pressure at greater than a defined frequency.
 15. The system of claim 10 wherein said gain adjust is adapted to be programmable through a wireless signal transmittable through the skin of a patient.
 16. The system of claim 10 wherein said pressure sensor is surrounded by a fluid to protect the pressure sensor from degradation and communicates with the fluid used to adjust the restriction device by a diaphragm.
 17. The system of claim 10 further comprising an output signal configured to induce satiety in a patient. 